from my post http://www.diyaudio.com/forums/showthread.php?s=&threadid=9195 I have rethought my next projecter project. I found that the system used in the projector to collect and focus the light works very very well, much better than a fresnel IMHO. I am currently thinking of a part express 5" lcd/delta lens projector as my next project. I am think a MH light (I have given up on LOAs for now). anyways, here is my general idea for my next projector, what i need now is how to figure out the correct lens size/focal lenth and spacing to scale this up. does anyone have any information on how i can figure the specs on the lens this design will use?
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It's all math
Someone posted this site:
http://www.optics-online.com/Image1.asp
For the math I think this is all correct...
For a fixed focal length lens it all depends on the distance from the screen to the lens and from the lens to the panel.
Basic formulas I know of are (maybe someone has some others):
A = distance between lens and screen
B = LCD panel diagonal size
C = lens focal length
D = diagonal size of the displayed image on the wall/screen
to determine how big the displayed image will be given a specific panel and lens:
D = ( A * B ) / C
to determine the required lens focal length given a specific panel for the desired displayed image size:
C = ( A * B ) / D
You can also do the calculations on the length and width, instead of the diagonal size, of the panel to find out the height and width of the displayed image size, etc.
Hope this helps
Someone posted this site:
http://www.optics-online.com/Image1.asp
For the math I think this is all correct...
For a fixed focal length lens it all depends on the distance from the screen to the lens and from the lens to the panel.
Basic formulas I know of are (maybe someone has some others):
A = distance between lens and screen
B = LCD panel diagonal size
C = lens focal length
D = diagonal size of the displayed image on the wall/screen
to determine how big the displayed image will be given a specific panel and lens:
D = ( A * B ) / C
to determine the required lens focal length given a specific panel for the desired displayed image size:
C = ( A * B ) / D
You can also do the calculations on the length and width, instead of the diagonal size, of the panel to find out the height and width of the displayed image size, etc.
Hope this helps
thank you, but I am intrested in the math to figure out the optics that will focus the light though the lcd panel using the two lens types in the diagram.
You might find it difficult to get the maths without getting involved in a whole lot of stuff you dont want so I am thinking if you could find an optics software program might be a big help for modelling.
I use reflectorcad and I find it very difficult to use because of my lack of understanding but a simpler program should be a big help.
I use reflectorcad and I find it very difficult to use because of my lack of understanding but a simpler program should be a big help.
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