I believe this link will describe the effect
http://www.extremetech.com/article2/0,1558,1157681,00.asp
John
http://www.extremetech.com/article2/0,1558,1157681,00.asp
John
From looking at his photos, I want to say Ace is using an angular ellipsoid reflector... I noticed he added more planes to his light pyramid. I'm only guessing, but it would make sense.
Ellipsoids have an advantage over parabolic reflectors in that they can pre-condense light. In some cases they can even make a separate condenser unnecessary. Here is more information about reflector shapes.
Ellipsoids have an advantage over parabolic reflectors in that they can pre-condense light. In some cases they can even make a separate condenser unnecessary. Here is more information about reflector shapes.
thanks guys.. its been a great help!! 😉
im still a newbie bear in mind so dont laugh....
what you guys think of a 400 watt MH with a relector.. possibly parabolic or ellipsoid. with a conenser
i know its a lot of heat .. but what do you guys think???/
im still a newbie bear in mind so dont laugh....
what you guys think of a 400 watt MH with a relector.. possibly parabolic or ellipsoid. with a conenser
i know its a lot of heat .. but what do you guys think???/
yoshi said:
It Will Come Soon, I Hope too...
Over 135 Thousand reads On This!!!
Still Waiting Too. Great Project He Has...
MovLab 🙂
Guys, sorry for not being around the past 3 weeks, my net conection dropped out as my isp had some major failure with the node for our street (can you beleive it?) it has just been fixed today and lets just hope it stays up lol, so for those who think im dead or have run off, that is not true, my net conection was simply down, and yess i payed my bill lol.
I have alot of emails to get onto so i will be quiet for the next couple of days until im back ontop of things, but ill get back to you all asap.
In the mean time ive been playing around again with light engines and found out a few discoveries. The big parabolic reflectors are ok but there is a way to get the light quite abit brighter and the image edges sharper then using one of those big hard to find reflectors for the cdm-t, ill talk about this soon, and also about the light box, thats had a total make over, its smaller, cooler, quieter, and stuctually stronger on the 250w model, it also now works diff from the previous model. The new model has a air mixing chamber and a new ducting system with air tight seals, it comes as a revision number 3 and plans will be available for it soon.
As for the projector there is a new model called the performance range, this uses a slightly diff light engine for a better performance, but it will cost about $67 more for the precision reflector used that is easily obtainable, there are also size ajustments in the light engine to acount the extra performance. This isnt fully done so ill keep you posted about it soon.
Trev
I have alot of emails to get onto so i will be quiet for the next couple of days until im back ontop of things, but ill get back to you all asap.
In the mean time ive been playing around again with light engines and found out a few discoveries. The big parabolic reflectors are ok but there is a way to get the light quite abit brighter and the image edges sharper then using one of those big hard to find reflectors for the cdm-t, ill talk about this soon, and also about the light box, thats had a total make over, its smaller, cooler, quieter, and stuctually stronger on the 250w model, it also now works diff from the previous model. The new model has a air mixing chamber and a new ducting system with air tight seals, it comes as a revision number 3 and plans will be available for it soon.
As for the projector there is a new model called the performance range, this uses a slightly diff light engine for a better performance, but it will cost about $67 more for the precision reflector used that is easily obtainable, there are also size ajustments in the light engine to acount the extra performance. This isnt fully done so ill keep you posted about it soon.
Trev
Sup dude, never thought you ran off, lol, cheers for the email and gettin ma stuff sent,
cheers mate,
cheers mate,
cool projector
ace how much are your plans and how do i get them i looked at some of your pics and i am a noob but they look well gd
ace how much are your plans and how do i get them i looked at some of your pics and i am a noob but they look well gd
Ace, good to have you back!
I just hvae on question I hope you can answer, I am planning on using your design for a projector. And just want to know what lcd is used can I use on of the 7" liliput xga tvs?
Thanks.
EDIT: Never mind, I'm almost positive that you use one.
I just hvae on question I hope you can answer, I am planning on using your design for a projector. And just want to know what lcd is used can I use on of the 7" liliput xga tvs?
Thanks.
EDIT: Never mind, I'm almost positive that you use one.
Heya King, the plan is not to have any updates and thats a part of the major delay, i want this thing to be at its full potentional right off the bat, this saves all money and time as we dont have to go upgrading and building new things for it all of the time.
I have 3 ranges of this projector now, standard X-70 (for the early parts buyers), the X-71 wich is a performance enhanced X-70 with minor changes ( just another condenser added and size changes in the light engine, and the X-71-EE ( extreme edition wich costs more and has diff sizes, highest performer). The reason i have done this is to acount for the people who bought some parts in the early days rather then having to buy new parts all over again, also for cost reasons, i beleive in giving people a choice to siut their budget, while also looking after those who have bought the parts in the early days. I honestly didnt think the EE model was going to come out, infact i wasnt even planning on making any other model other then the first X-70, its only time and evolution that has changed this for me and my willingness to get the best out of somthing with what we have.
Ill probally cut down the models to only having 2, the X-71 and the X71-EE at a latter date, there is only a few who have the parts for the X-70, but they have to be acounted for, they will also have the free upgrade acess to the higher models as they use basically the same parts, just minus a few xtras where as its the're choice to go the full way or not. People who have the parts for the X-70 can upgrade to the X-71, but the X-71 is different from the X-71-EE. The biggest difference is sizes within the light engine its self. I know it sounds confusing, kind of hard to explain lol.
There is also a wood model thats comming out and that will be a totally diff set of plans, the constrution on that model is alot faster as we dont have to worry about scratches nor polishing, that will be out right after the plexi one and houses the same internal sizes with the only diff being abit of construction technique and the outer box.
So there we have it, 3 models, no upgrades if possible other then a few minor electronic modds so as we dont have to go rebuilding the whole thing again. Its a rock solid design with no ajustments to be made, and all is interchangable, just be acurate! and your results will follow as expected. I garentee my work to be fail safe and thats how your projector will be.
1 modd that will come is the turn over from using the copy lens to the vari triplet, this is a simple modd that we can do in a matter of min's, we will get onto that as soon as i have the forum up for it and we are all going.
Trev🙂
Re: light box
Heya Bal, sure i can post up the old design again, ive upgraded the patent to the new design the other week. The old design can give u an idea on how the system works, though the new is somwhat diff from the old.
Trev
balal_arif said:
Heya Bal, sure i can post up the old design again, ive upgraded the patent to the new design the other week. The old design can give u an idea on how the system works, though the new is somwhat diff from the old.
Trev
Re: light box
Yeah dont go using soup labbels, they scatter the light for starters and 2 they fry your bulb to a pulp taking manny hrs of life from your bulb, they make your projector also run alot hotter due to the light being scatterd all over the place and from a lack of airflow or heat convection over the bulb's arc area.
Ive tested out those big parabolic reflectors too, sure they work but they arent so bright, why you guys might ask, well considering the size of them and how far the reflective surface is from the arc the image becomes dim on the outside of the image with a hot spot in the center, we waste light in a fashion where as the arc is too far away from the outer reflective surface, the reflected light becomes darker then the light's arc, and thats why we always will get a hot spot from a large (100mm)parabolic type reflector. They arent bad but there are other ways and other things we can use as a parabolic source that are much better IE: half of the sphericals focal becomes perfectly parabolic strait lines, this is well known that you can use a spherical as a parabolic reflector and if you didnt know, you do now lol.
Having parabolic light rays through a condenser also works aswell, ive tried it and tested it, i didnt have any problems and the image was very bright. Using a precision spherical has advantages to us, they are relativly flat in shape so the light thats being reflected is actually less distorted giving us a sharper image on the edges, the light is more pixel perfect, and the light is alot brighter because we have a very high quality surface and the lamps arc is close to the reflector meaniing the reflected light is much brighter. I first noticed a big change in contrast, my black levels went very black and yet the pixels that are suposed to be yeilding light in the image, was, much brighter then before with any other reflector.
Im ordering a new reflector that is precision for us guys, trying to get them at the right price and focal is the hard thing, ill have one next week as i think this $300 one i have is abit out of a price range lol and ive been told its over spec for what we need. The one i have now ive tested as a parabolic and it runs no probs, the new one ill order next week will be of a lower spec and have the shorter focal so its run as a sperical and so that we are getting the correct rays of light at the right coresponding angles that we need, for it to be run as a spherical. Spherical is brighter then parabolic, hands down, but it has to be configured right, we have a very narrow margin for error. Another candidate is whats called a rod reflector, i think they would be the ducks nuts in what we need to get the image very perfectly lit, also there would be no distoring on the outer edges of our image. Ill keep you guys posted about this.
Trev
balal_arif said:
Yeah dont go using soup labbels, they scatter the light for starters and 2 they fry your bulb to a pulp taking manny hrs of life from your bulb, they make your projector also run alot hotter due to the light being scatterd all over the place and from a lack of airflow or heat convection over the bulb's arc area.
Ive tested out those big parabolic reflectors too, sure they work but they arent so bright, why you guys might ask, well considering the size of them and how far the reflective surface is from the arc the image becomes dim on the outside of the image with a hot spot in the center, we waste light in a fashion where as the arc is too far away from the outer reflective surface, the reflected light becomes darker then the light's arc, and thats why we always will get a hot spot from a large (100mm)parabolic type reflector. They arent bad but there are other ways and other things we can use as a parabolic source that are much better IE: half of the sphericals focal becomes perfectly parabolic strait lines, this is well known that you can use a spherical as a parabolic reflector and if you didnt know, you do now lol.
Having parabolic light rays through a condenser also works aswell, ive tried it and tested it, i didnt have any problems and the image was very bright. Using a precision spherical has advantages to us, they are relativly flat in shape so the light thats being reflected is actually less distorted giving us a sharper image on the edges, the light is more pixel perfect, and the light is alot brighter because we have a very high quality surface and the lamps arc is close to the reflector meaniing the reflected light is much brighter. I first noticed a big change in contrast, my black levels went very black and yet the pixels that are suposed to be yeilding light in the image, was, much brighter then before with any other reflector.
Im ordering a new reflector that is precision for us guys, trying to get them at the right price and focal is the hard thing, ill have one next week as i think this $300 one i have is abit out of a price range lol and ive been told its over spec for what we need. The one i have now ive tested as a parabolic and it runs no probs, the new one ill order next week will be of a lower spec and have the shorter focal so its run as a sperical and so that we are getting the correct rays of light at the right coresponding angles that we need, for it to be run as a spherical. Spherical is brighter then parabolic, hands down, but it has to be configured right, we have a very narrow margin for error. Another candidate is whats called a rod reflector, i think they would be the ducks nuts in what we need to get the image very perfectly lit, also there would be no distoring on the outer edges of our image. Ill keep you guys posted about this.
Trev
Heya Trick, ive actually fooled around with that a couple of months ago regarding the pyramid design, curved, strait, angled, you name it, if you want a perfectly lit image, have a striat pyramid and not a angled, if its angled the light will tend to run along the reflective surface then reflect from it, also the angle of the light will be incorect, ive worked it out on this moddel its fairly spot on for where it needs to be, unfortunatley its impossiple in this design to run it perfectly strait, and having it perfectly strait can actually chew us light in the way of intensity as the light isnt traveling strait through the lcd.
To be honest my pyramid does nothing as ive controlled the light with the condensers and that yeals a much better result as we arent having any criss crossed light over our lcd, the lcd is also cooler this way. Pyramid or not, i get the same image result on the final design, and thats where we want it to be.
We can make the light in a pyramid travel in a parabolic manner aswell, ( if you desire to rely on one), thats not so hard, it has to be a curved pyramid, i did this a while back, but having light in a parabolic manner through a frensel thats not designed to have parabolic light through it ( focal angle vs ring pitch) will actually show us all of our frensel rings and actually damage the frensel.
I totally agree and thats what ive try to tell people for quite a while, elipsidal reflectors is where we need to be, but cost and avaiability is the issue and trying to find the right one with the right focal combinations isnt so easy lol.
Trev
Hello ace
glad to see you back. Is this what you mean by large reflector causeing hotspots?
(See attached picture)
I'm just trying to understand what you mean by parabolic light. Do you mean parallel light rays derived from a parabolic reflector, or just light rays that enter the light path from the wrong angle?
DJ
Attachments
How about i do you a pic with a parabolic type of reflector, ill elaborate in it why we always get the hot spot.
Btw, There is no cure for a hot spot, but we have ways we can rid the hot spot so it can be enough for the eye not to reconise. That takes a light pipe.
Lets Firstly take a look on how things work, the pic should explain enough for you to understand it.
Trev
Now take a look at this, even our arc on its own can cause a hot spot, depending on our panel size this can be quite bad, on a small 7 inch its aceptible, on a big 17inch it gets quite bad.
After veiwing these pics i hope now you guys can see why we always get hot spots from parabolic reflectors, spherical reflectors dont have this problem as all of the light is directed back to the source, and with a spherical type system the only hot spot is actually from the bulbs arc as explained in pic 3.
Trev
After veiwing these pics i hope now you guys can see why we always get hot spots from parabolic reflectors, spherical reflectors dont have this problem as all of the light is directed back to the source, and with a spherical type system the only hot spot is actually from the bulbs arc as explained in pic 3.
Trev
- Status
- Not open for further replies.