Ace_3000....pictures of Projector?

[ace3000_1]

Originally posted by balal_arif
ace,
are you able to ell us the details about your light box design..
i understand you removed the pictures since you were trying to patent it..
have you done that yet?
if so is possible for you to show some details of the design?
if not
could anybody help me out with a decent light box design???

thnaks in advance

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

[ace3000_1]

Here is the pic, wouldnt work in my last post for some reason.

Trev

[ace3000_1]

Originally posted by balal_arif
i appreciate the link
thank you
but i do understand that a soup ladel for a reflector is perhaps not the most optically precise thing to use!
i was thinking along the lines of a parabolic refelector... and the only guy i know to have played about with this idea is ACE!
if any of you guys can help me out id appreciate it a lot!

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

[ace3000_1]

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.

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.

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.

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

[Dazzzla]

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

Hello ace
glad to see you back. Is this what you mean by large reflector causeing hotspots?
(See attached picture)

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'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

[ace3000_1]

glad to see you back. Is this what you mean by large reflector causeing hotspots?

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

[ace3000_1]

Pic 1

[ace3000_1]

Now in this next pic we can clearly see why we have the hot spot, the pic should explain why, the closer the arc is to anything the brighter it will be, anything that travels further will always be dimmer.

[ace3000_1]

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

[ace3000_1]

Grrrr pic 3