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Prisms

DJZ

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Aug 27, 2008
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This is an old school way of doing color modulation. Just to the left is a set of scanners, one to move the beam to the side so that it gets blocked after the prisms and before the X/Y scanners (blanking), the other scanner is to sweep the beam up and down on the prism (color modulation). Just to the right is the set of X/Y scanners. Part of an old projector I want to restore one of these days. Thought you guys might enjoy the beam shot!
 

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So one scanner is for blanking, one for color selection and then the X/Y set?
 
Yes. This was before PCAOMs! And was a very creative way of modulating color. In all this old projector has 3 scan heads and 2 color mod/blanking paths.
 
Need to get that thing up and running.

I agree completely! Needs a lot of work though. I also need to get rid of my air cooled ion and replace it with a water cooled. During the summer my office AC just can't keep up during the day.

Here's a shot from another angle, at the very top sorta to the left of center, what looks like a green dot is actually yellow, just to the right of that is red. Those 2 colors would make it to the scan heads if the shutters were open. As the beam is swept up and down on the prisms a different color reaches the scan heads.
 

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I don't fully understand what's happening in the pic, but it's an awesome image! Thanks for sharing!

cheers!
 


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