[CTP detail] the laser spacing of a PT-R machine?

[george young]

hi,
i am developping CTP machines for a client. i am very curious to know the laser spacing of an older Screen PT-R machines. i know they use discrete laser diodes and optical fibers to conduct laser light before a lens but i wonder if their laser dots are 'consecutive'? i.e. dot1/2/3/4/5.../64 are next to each other w/o spacing?
i am asking this b/c the laser constraints that my client gave me, has empty spaces btw laser dots which adds quite a bit of computing load to the pre-processing and also make the line alignment more challenging than if there's no space in between.


thanks a lot!
-george

 

[gordo]

Just speculating here, but since the laser spots would have a gaussian energy profile, wouldn't they actually need to slightly overlap to avoid artifacts?

best, gordon p

 

[george young]

Just speculating here, but since the laser spots would have a gaussian energy profile, wouldn't they actually need to slightly overlap to avoid artifacts?

best, gordon p

hi Gordon,
you're totally right, the dots are slightly larger than an 'ideal pixel'. the laser dot i have is '12 by 4' um for 2540dpi (ideally 10um square pix). what i was asking is that, is there spacing btw two 'ideal pix' in a PT-R?

best
-george

 

[george young]

i think i found the answer:
http://www.patentstorm.us/patents/pdfs/patent_id/5225924.html