I've been looking over the site to see if there was a way to "downsize" the dimensions of the enclosure. I'm not really up on the optical end of construction, (I am a computer homebrewer/modder), so if this is not feasable I'd rather know now than later. My thought is to mount the LCD horizontally rather than vertically and use mirrors to reflect the light to the projection lenses. (See attached *rough* drawing). Do I have to "condense" the light between the LCD prior to reflecting it to a expansion lens setup before entering the Projection lens assembly?
Am I fooling myself in thinking that this would work?
Am I fooling myself in thinking that this would work?
Attachments
unit 24
I am new to this and just at the reading stage. Are you trying to reduce length, if so with those 15" mirrors you have gained a lot of height 3x say 10" because of the angle thats 30" high if you see what i am getting at. So would you not be better building an upright free standing unit that would just use one mirror after the lcd.
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! / !
! / !
! / ---------!-->
! / !
! / _!
!
!
!
!
__________fresnel
__________lcd
__________fresnel
___condensor
___ light source
___ reflector
Also do you not loose a bit of brightness for every mirror you have to come of.
Like i say i am no expert just been reading the last few days.
I am new to this and just at the reading stage. Are you trying to reduce length, if so with those 15" mirrors you have gained a lot of height 3x say 10" because of the angle thats 30" high if you see what i am getting at. So would you not be better building an upright free standing unit that would just use one mirror after the lcd.
--------------
! / !
! / !
! / ---------!-->
! / !
! / _!
!
!
!
!
__________fresnel
__________lcd
__________fresnel
___condensor
___ light source
___ reflector
Also do you not loose a bit of brightness for every mirror you have to come of.
Like i say i am no expert just been reading the last few days.
I believe you're referring to a folded design. Have you looked up any plans yet?
Lumenlab and diyprojectorcompany have some nice write-ups. They also sell some hard to find items you'll need as well.
Good luck either way.
Lumenlab and diyprojectorcompany have some nice write-ups. They also sell some hard to find items you'll need as well.
Good luck either way.
sjetski71,
You are right, I am looking at folding the entire design to make it smaller. I think I need to condense the light after passing it through the LCD, hopefully this will allow me to reduce the size of the mirrors/lenses prior to the projection lens. I'm hoping that this is possible, I'd like to have as large an LCD but as small a box as possible.
btw, small world huh?
xxiv
You are right, I am looking at folding the entire design to make it smaller. I think I need to condense the light after passing it through the LCD, hopefully this will allow me to reduce the size of the mirrors/lenses prior to the projection lens. I'm hoping that this is possible, I'd like to have as large an LCD but as small a box as possible.
btw, small world huh?
xxiv
This is quite a nifty double folded design I found, hope it gives you some ideas.
http://translate.google.com/transla...&hl=en&ie=UTF-8&oe=UTF-8&prev=/language_tools
http://translate.google.com/transla...&hl=en&ie=UTF-8&oe=UTF-8&prev=/language_tools
Maybe a referal to a PJ using a LCD closer to the size he's consdering using would be a lil more appropriate so he can judge how large the enclosure will be as the link to that PJ Quinn is using the 7" Lilliput.
Maybe this one will give you a better idea how big the box will be...keep in mine though this is still only 10.5inch screen http://allinbox.com/hakkukakt3/hakkukakt.htm
Hope this helps
Maybe this one will give you a better idea how big the box will be...keep in mine though this is still only 10.5inch screen http://allinbox.com/hakkukakt3/hakkukakt.htm
Hope this helps
Unit 24,
For a 15 inch LCD you need a lens with a focal length of 320 - 450 mm. The lens will focus about 10 - 15 inchs away from the LCD. Based on the size of the LCD you want to use and the sketch of your drawing your box would be huge and would not work. The light engine looks about right but the lens is way to far away from the LCD panel. The good news is that you can basically eliminate the entire last chamber.
Forgive me for using your picture but you need something more like this.
Hezz
For a 15 inch LCD you need a lens with a focal length of 320 - 450 mm. The lens will focus about 10 - 15 inchs away from the LCD. Based on the size of the LCD you want to use and the sketch of your drawing your box would be huge and would not work. The light engine looks about right but the lens is way to far away from the LCD panel. The good news is that you can basically eliminate the entire last chamber.
Forgive me for using your picture but you need something more like this.
Hezz
Attachments
Your pretty much stuck with what Hezz has given you bud, simple fact is the LCD is 15 inch and the focal length of the lens required is long. Want a smaller projector get a 7 inch lcd lol.
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