Hello im a Noob to lumenlab i have been reading and reading and reading and im still a little confused
i have a 45'' sony rptv that has sound but no pic i know its not a big screen im just looking to play my xbox 360 and watch some hd movie i would really love everyones input on what to use for it im up for anything

the reason im not making a actual pj is becasue im renting a house and have limited room.
If you need more pictures please let me know. i have read alot of the other projects but get lost in the language

If you have any problems with language just post a list in the beginer forum and im shure someone will help. Anyway, for an rptv you probably want a small projector and you want high def. At the moment that leave only one choice and that is to build a projector based on the 10.6" lcd that johnzo is selling. Or you could wait for the 7.2" lcd to become avalabe. Both are HD native and HDCP (compy protection thing, dont get me started about it) compatable.

Thanks for the input i will look into it and keep posting on the project

I am gearing up for a similiar project with a 47" RPTV.

By the way, your TV screen looks a heck of a lot bigger than mine.
Did you measure it diagonally?

I am not going HD or widescreen because the aspect of the RPTV is 4:3 & seeing as how I am only SD for now with directv my main SD TV viewing will wind up being pretty small if I fit the 16:9 picture to the screens edges.

You look to have a bigger screen so you can probably afford to make a widescreen projection fit.

For me, a 4:3 LCD will fit perfectly.

I will double check when I get home I'm sure I measured diag I am also going to start gutting it and are wat I am going to need for the project I'd like to get it done soon my wife wants her sun room back ha ha

WHen you gut it dont touch the big mirror.

LOL!!!!!

when I was pulling the len's out of mine, it's all I could think of.
"Don't touch the mirror"
"Don't touch the mirror"

when one of my friends came over to see what I was doing, the first thing I told him before even saying hi was "don't touch the big mirror" LOL!

It's no biggie.
It just looks huge compared to mine in that picture.

Thanks for the heads up bout the mirror I want to gut it so I can measure and if I need to make anything start on that I work at a cabinet shop so I have access to any type of wood and machinery I'm also good with electronics when it comes to making boards or soldring ha ha

ok so i gutted the tv and took some pics and measurements, i would like to do a 10.6 pj what do you guys think

I think that is a 4:3 screen so I don't think I would go with the 10.6. I would just use a 15" LCD.

wow 15" You really think i can fit one in

Oh yeah take a look at SPK's plog he has a 15"er in there. mind telling us how far it is from the floor to the middle of mirror to the screens so we can tell you for sure if it will fit.

Ok I popped the mirror housing in and measured 36 1/2" from floor to the middle and from the middle of the mirror to the screen it was 12" if I missed anything please let me know. If the measurements work out I will make my box and start ordering parts needed

Juan C

We have similiar goals.
I will be using a 9.6" LCD TV which means my throw distance is greater than yours by about a foot using a 320 mm lens.

I will have to fold it to make it all fit or get a much shorter triplet.



Unfortunatly my TV is in my parents garage.
It's darn heavy so it's just a matter of waiting until one of my friends can help me lug it over to my house so I can strip it down.

Yea I guess they are similar my q is Am I still going to be able to do 1080p with a short throw 15" pro. I'm making drawer boxes at work I'm going to make my box I have a rough diagram but don't know how high to
make the box

Heres a very quick diagram of how it should look

Wow, that's one awesome illustration!

The bottom part says about a foot extension on the tv do you mean like litteraly adding about a foot to the cabinet to make it higher, sorry if i seem like a retard i just like make sure im understading correctly before doing it ha ha
Thanks again
Juan

Yeah that will give you room to put the projector in the bottom, the triplet just needs to be 36 inches from the mirror. You have said its about 36 1/2 from the floor to the center of the mirror, so all you need to do is pretty much cut a whole for the triplet in the bottom of the cabinet and put the triplet in it. So depending on how big your projector is, thats how much you need to extend it.

Big 10 4 bossman. ha ha i'll make a mini cabinet about 13 inches high and 40'' wide to make up for the base and the build another box for my pj im just going to use the simple 15" box i think that will work. If not let me know i check the forums from my blackberry so any updates ill get.

p.s depth of the box is going to be 19" thats how deep my cabinet is for the tv

Hmmm, my TV is so similiar to your's.
I don't think I have a chance in heck of making a 9.6" LCD work in it with a standard lens.
Just not enough space.

Luckily i've got a 15" LCD also.

Tescorp sells shorter focal length triplets on his website, i am going to be useing a 220mm triplet for my next build but he has all the way down to 180mm.

I was also thinking of that copier lens people talk about.

ok guys i had to shift gears for a couple of days my computer desk broke apart so i
decided to make a new one out of cherry i took some pics lemme know what ya think

I know is off topic but i needed a new desk ha ha

Pics are with my blackberry it was the only thing i had

Click to view attachment

Click to view attachment

When can i buy one? Nice desk, you have some serious wood working skills.

[quote name='x_25' date='Aug 4 2007, 11:37 PM' post='245374']
When can i buy one? Nice desk, you have some serious wood working skills.
[/quote


Ha Ha thank you i enjoy wood working especially when its something i design and make everything on
i need to stain it when i do i will take some better pics of it all done and finished then ill jump back on the projector.

If anyone is interested in deminsions of the desk and plans let me know ill draw them up

Juan C

Is there anyway i can do this without adding to the bottom of the cabinet i really would like to keep this stock looking as possible.

Thanks
Juan C

The angle of my original lens were not the same as the one in your picture.
I have a different idea.





It uses an added mirror, but I think there should be enough room to put a folded projection box in the TV cabinet & use a small adjustable mirror on the back to aim at the main mirror.

If you need to you can always scoot the projection box out the back of the TV if you need that extra throw distance.
It would look much better & be less work than adding on to the bottom I think.

Note: I have to use MS paint at work & I havn't actually looked at your box dimensions so I may not know what i'm talking about.

That might work im going measure it out tommorow and draw something up is their a minimum demension on a pj?

I'm not sure on minimum dimensions.
I was looking at the folded forum & got the idea for mine.
I've got a few more inches though to play with.

I saw the inner dimensions of your were about 30inches.

But it also looks like you can cut out some inner material to make that wider.

From looking at the focal length calculator your going to need at least 18" between the fresnal/lcd to the lens.
If you fold it you should be able to get the lens in the center of the TV.

It just depends on how wide you can make the base.
You still need to fit a lamp in there.

That wouldn't work I don't think, because no matter what way you project at a mirror it comes off at 90 degrees. In that diagram the light path show is not at 90 degrees off of either mirror.

Ok I figured it out if you don't want the 1' extension on there you need to get a and then judt look at the diagram!

Angle of incidence equals angle of reflection.

If you shoot a beam of light at a mirror at a 30 degree angle, it will bounce off at a 30 degree angle. If you shine a flashlight straight into a mirror (zero degrees), the beam will come right back at ya.

Tgreenwood

right, but it still makes a 90 degree angle (flahlight onto mirror come back at you, the light path makes a 90 degree angle with the mirror)

But wht if the flashlight comes in at 33* to the mirror? Then it bounces off at 33*.

If I go by the angle of the original projection lens from the RPTV the projected image source has to come fron the front of the cabinet at an angle.

I found this that illustrates mirrors & reflection.

http://www.glenbrook.k12.il.us/gbssci/phys...fln/u13l1c.html

Lesson 1: Reflection and Its Importance
The Law of Reflection
Light is known to behave in a very predictable manner. If a ray of light could be observed approaching and reflecting off of a flat mirror, then the behavior of the light as it reflects would follow a predictable law known as the law of reflection. The diagram below illustrates the law of reflection.



In the diagram, the ray of light approaching the mirror is known as the incident ray (labeled I in the diagram). The ray of light which leaves the mirror is known as the reflected ray (labeled R in the diagram). At the point of incidence where the ray strikes the mirror, a line can be drawn perpendicular to the surface of the mirror; this line is known as a normal line (labeled N in the diagram). The normal line divides the angle between the incident ray and the reflected ray into two equal angles. The angle between the incident ray and the normal is known as the angle of incidence. The angle between the reflected ray and the normal is known as the angle of reflection. (These two angles are labeled with the Greek letter "theta" accompanied by a subscript; read as "theta-i" for angle of incidence and "theta-r" for angle of reflection.) The law of reflection states that when a ray of light reflects off a surface, the angle of incidence is equal to the angle of reflection.