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ggoktt
Joined: 20 Nov 2009
Posts: 43
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| Posted: Wed Jun 02, 2010 2:35 am Post subject: My vision |
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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AnalogRocks
Forum Moderator
Joined: 08 Mar 2006
Posts: 26706
Location: Toronto, Ontario, Canada
TV/Projector: Sony 1252Q, AMPRO 4000G
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| Posted: Wed Jun 02, 2010 2:39 am Post subject: |
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been done
_________________
Tech support for nothing
CRT.
HD done right!
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ggoktt
Joined: 20 Nov 2009
Posts: 43
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| Posted: Wed Jun 02, 2010 2:39 am Post subject: |
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The Purple is LC
The blue is Mirror
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ggoktt
Joined: 20 Nov 2009
Posts: 43
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| Posted: Wed Jun 02, 2010 2:44 am Post subject: |
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oh! NO! T design too wide! MyEnglish is bad! I hope you can read!
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ggoktt
Joined: 20 Nov 2009
Posts: 43
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| Posted: Wed Jun 02, 2010 2:47 am Post subject: |
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Facilitate convergence adjustments! At once! To facilitate the projection size change!
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cmjohnson
Joined: 03 Apr 2006
Posts: 5180
Location: Buried under G90s
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| Posted: Wed Jun 02, 2010 2:51 am Post subject: |
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It has been done. It is not very good.
You still have to converge all three CRTs. No advantage.
The optical core is expensive to make.
The projector is bulky.
No, not a good idea.
CJ
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tse
Joined: 03 May 2006
Posts: 1014
Location: Sweatbucket, Fl.
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| Posted: Wed Jun 02, 2010 2:58 am Post subject: |
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How much light is lost in the "x" cube?
Scott
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Thomas Jefferson
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ggoktt
Joined: 20 Nov 2009
Posts: 43
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| Posted: Wed Jun 02, 2010 3:01 am Post subject: |
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2 tube 8%!(mirror),3 tube 2% （（92%+92%+100%）*98%）/3=？
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ggoktt
Joined: 20 Nov 2009
Posts: 43
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| Posted: Wed Jun 02, 2010 3:44 am Post subject: |
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Image is not a ladder, and can be full pipe surface. Therefore, the brightness will not be reduced.
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cmjohnson
Joined: 03 Apr 2006
Posts: 5180
Location: Buried under G90s
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| Posted: Wed Jun 02, 2010 3:54 am Post subject: |
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It has been done. It was NOT good enough to keep doing it. Too much light was lost in the prism assembly and you still have to converge
all three tubes.
It is a PROVEN Bad Idea. Don't waste your time on it.
CJ
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CZ Eddie
Joined: 23 Mar 2006
Posts: 1601
Location: Austin, TX
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| Posted: Wed Jun 02, 2010 4:11 am Post subject: |
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I say go for it. 
I know it's far from the same thing, but the first thing I thought of was the old JVC CRT projector with it's mirrors.
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Back after a digital sabatical.
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ggoktt
Joined: 20 Nov 2009
Posts: 43
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| Posted: Wed Jun 02, 2010 4:18 am Post subject: |
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My design is more simple! Prism light losses are small, do not worry! I am worried that diffuse, polarized lenses may need!
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ggoktt
Joined: 20 Nov 2009
Posts: 43
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| Posted: Wed Jun 02, 2010 4:24 am Post subject: |
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tube and the tube can Press closer, smaller than the current narrow.
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JustGreg
Joined: 07 Mar 2006
Posts: 3098
Location: Kenosha, WI
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| Posted: Wed Jun 02, 2010 5:09 am Post subject: |
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| CZ Eddie wrote: | I say go for it.
I know it's far from the same thing, but the first thing I thought of was the old JVC CRT projector with it's mirrors. |
 That's quite the beast Eddie! Looks like the ceiling of a studio.
I say go for it too. I didn't think this hobby was to 'prove' anything to the world but rather to have fun. If the guy is having fun who cares if it ends up the worlds most expensive shadowgraph and is only good for hand puppets.  Who knows..he may hit on something that will open up a market for 7" tubes. (That's a stretch but you get my meaning).
_________________
Greg
"Is it ignorance or apathy? Hey, I don't know and I don't care!" --Jimmy Buffett
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David_Web
Joined: 02 May 2007
Posts: 418
Location: Sweden
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| Posted: Wed Jun 02, 2010 3:44 pm Post subject: |
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Distance of R & B are different than G.
You will loose a LOT of light due to distance to lens.
I would estimate 10-20% will come out the front vs what is generated by the tube.
Even though phosphor have some directionality when generating light it's still not enough for having the lens that far away.
There is a paper somewhere around that discusses the "directional" phosphor vs normal lambertian distribution.
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SNR of people are ridiculously low.
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Tim in Phoenix
Joined: 21 Oct 2006
Posts: 4409
Location: Phoenix
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| Posted: Wed Jun 02, 2010 5:12 pm Post subject: |
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Hello
Dichroics do not work immersed in fluid. In air, the light loss is near 50%.
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cmjohnson
Joined: 03 Apr 2006
Posts: 5180
Location: Buried under G90s
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| Posted: Wed Jun 02, 2010 5:33 pm Post subject: |
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Many excellent engineers have tried many configurations for CRT projection.
Only one CRT projector ever used such a system as the one you describe.
It was not very successful.
I say again, this is not a good idea. It will not succeed. Do not waste your time on a bad design.
CJ
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Ben851
Joined: 13 Sep 2008
Posts: 221
Location: Ottawa, Ontario
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Spanky Ham
Joined: 22 Mar 2006
Posts: 5643
Location: Comedy Central
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| Posted: Wed Jun 02, 2010 6:37 pm Post subject: |
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What are you trying to accomplish? Is this just for fun or does it have a specific purpose?
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