Thinking about my Octagon
Posted: Wed Jul 11, 2012 9:21 pm
Some thoughts on the future project.
A while back i scrapped a laser printer and it had a very nice 8 sided polygon
mirror ..being 8 sided so i suppose its really an Octagon.
I would like to use this in a televisor project ,from a quick test i think i can control it via a clock circuit .
I suppose the circuit that controls the motor has hall effect sensors and such so doing away with a encoder my end anyway .
So i think it will run true to the clock frequency fed to the circuit and or perhaps some voltage adjustment as with what we have to do every time me make the club circuit and adjust it to the motor used ....perhaps.
The neatest way not the only way to do the other scan is to use another rotating mirror ...you can either go laser projection or direct view off the other mirror like a mirror screw ..since i am still at the thinking stage about this i am not sure which way i will go once i get around to it.
I do like the easier direct view since the luxeons easier to modulate for me anyway and i like i get a black and white image and a bit safer than bouncing a laser off mirrors...when i made this quick polygon mirror drum
all i had to do was point the luxeon at the mirrors no optics needed .
http://www.youtube.com/watch?v=2qPE9JeCg14&feature=plcp
you can see the eye of the world and NBTV test cards in that quick video.
I would also like to do a better multi system televisor last one had to much wobble at 60 lines to be useful.
Since that should be no problem for a laser polygon mirror that side of it should be better ...for a 8 sided mirror we are talking i think 3000rpm for 32 line around 6000rpm for 60 line ...i think these things can run from 5000 to 10000rpm .
What this one can do i will find out in time...
A while back i scrapped a laser printer and it had a very nice 8 sided polygon
mirror ..being 8 sided so i suppose its really an Octagon.
I would like to use this in a televisor project ,from a quick test i think i can control it via a clock circuit .
I suppose the circuit that controls the motor has hall effect sensors and such so doing away with a encoder my end anyway .
So i think it will run true to the clock frequency fed to the circuit and or perhaps some voltage adjustment as with what we have to do every time me make the club circuit and adjust it to the motor used ....perhaps.
The neatest way not the only way to do the other scan is to use another rotating mirror ...you can either go laser projection or direct view off the other mirror like a mirror screw ..since i am still at the thinking stage about this i am not sure which way i will go once i get around to it.
I do like the easier direct view since the luxeons easier to modulate for me anyway and i like i get a black and white image and a bit safer than bouncing a laser off mirrors...when i made this quick polygon mirror drum
all i had to do was point the luxeon at the mirrors no optics needed .
http://www.youtube.com/watch?v=2qPE9JeCg14&feature=plcp
you can see the eye of the world and NBTV test cards in that quick video.
I would also like to do a better multi system televisor last one had to much wobble at 60 lines to be useful.
Since that should be no problem for a laser polygon mirror that side of it should be better ...for a 8 sided mirror we are talking i think 3000rpm for 32 line around 6000rpm for 60 line ...i think these things can run from 5000 to 10000rpm .
What this one can do i will find out in time...