Cooling a DYS bulb

[tjh]

Originally posted by efractal
I have the same projector also, but I'm waiting on my LCD which should be here in 2 days. Anyone have pics from a OHP with a DYS bulb?

If the results are good I plan on making a 3 part fiberglass box to house the OHP and a fiberglass stand to rest the LCD on and provide cooling.

My screen is 15" and the stage area is only 10x10 though. I'm worried about that ....

As stated above there's tons of light leakage with these. Fiberglass housing should be nice, but it's not exactly the most friendly thing to work with. As far as the staging area goes your going to lose a bit of your screen on either side, and the corners will be cropped a bit because of the way the fresnels are shaped. To get a bit more coverage pull the fresnel out from below the glass and put it above, under the lcd. Also for more direct light you can cut into the plastic frame up top as I did. (it cuts quite nicely with a hack saw or for corners a jig saw) If you really want to be able to see everything on this OHP you'll have to cut the plastic top and buy new fresnels that are larger.

I can't put up pictures yet as I'm waiting on a new pair of fresnels and in experimenting messed the others up pretty badly. But once those arrive, hopefully later this week, I'll pop some up.

[efractal]

Here is my inspiration for the fiberglass housing:

My version:

I have no idea what that is, but its the perfect shape and look for my room. Very 60's Sci-Fi I work with Fiberglass alot so this will be a simple design.

Its going to be a thin wood skeleton, 3 parts. Bottom part will wrap around the OHP lightbox base (I'm keeping the metal base since it acts as a heatsink). The largest rectangle will cover the length of the adjusting arm (which will probably be removed completely). And the top will be a circle with a hole cutout for the lense. I need my LCD before I can start building though. It will not be adjustable when its done.

Thanks for the tips about the fresnel. When my screen gets here I will start modding the staging area.

Also for more direct light you can cut into the plastic frame up top as I did. (it cuts quite nicely with a hack saw or for corners a jig saw)

Are you talking about the housing for the lens/mirror? Have any pics?
My Dremel likes to cut stuff

[efractal]

Forgot: I plan on making a triangle inner-box to guide the light to lense. Not sure if that will help at all. I will use carboard to run some trial tests

[Tritoch84]

For some reason now, I get a bright spot in the middle of the picture, it's the OHP, and not the panel....

Wonder how to fix this? I'd like to make this setup last as long as possible (like others!)

[tjh]

Originally posted by efractal

Are you talking about the housing for the lens/mirror? Have any pics?
My Dremel likes to cut stuff

Talking about the white top part of the OHP that the slides would normally lay on.

I really like your idea for the design. Although because it is so enclosed you may need some more air flow (extra fan or something). Best way to find out is just experiment.

As far as the inner box goes you want to cut down on as much stray light after the lcd as possible. So that plus painting the inside of the box black should aid in the picture.

Originally posted by Tritoch84
For some reason now, I get a bright spot in the middle of the picture, it's the OHP, and not the panel....

Wonder how to fix this? I'd like to make this setup last as long as possible (like others!)

The light spot may just be that the lamp is too close to the lcd. Luckily in the AI-1000 this is adjustable. Take a flat head screw driver and turn the screw on the back of the OHP, in where there is room to fold up the power cable. No guarantees as to if this will help, but it's worth a try.

[Tritoch84]

Thanks! I'll tinker with it.

Now if I could only get a higher contrast image.

I think thats what everyone is trying to get though, heh.

I think it needs a replacment mirror, and a new fraynel lens, it's rather dirty with stuck on stuff, and the mirror in the ohp looks like it's been damaged right where it reflects, not sure how big a deal this is, I'm still learning.

Things again.

[Me2!]

Very cool design. Looks like it needs tenticles though.

[Tritoch84]

Well, I tried moving that "screw" in the back to raise and lower the bulb, and if I so much as move it a little, the top of the projected image becomes blurry (but not the panel)! It only looks ok when I leave it all the way turned to,,,can't remember, I think all the way down (the way it came) or else the top of the projected image gets blurry.

I'm kind of a newb, what causes this?

[tjh]

Did you try compensating by refocusing the lens again up top?

[Tritoch84]

Oh of course! Nothing focus's it. However...

I don't know much about mirrors, but mine seems mighty,,,well, burnt, when the OHP is on. Looks nice and clean when it's off, but when it's on, the area where it's been used the most is really blurry looking, on the mirror itself. When I move the OHP mirror to the top of the ceiling, the problem is NOT there(Or not as bad, depending on how far up I move the bulb)! I don't understand.....

Guess I'll figure it out one day.