Archive of the former Yahoo!Groups mailing list: Homebrew PCBs
Subject: Re: Blue Laser LDI Dry Film Results using a Polygon mirror and laser from a laser printer (old style laser)
From: "Andrew Mathison" <andrewdavid.mathison@...>
Date: 2009-11-26
Hi,
if I have understood correctly, there are some thoughts that the laser will move too fast to "develope" the light sensitive surface.
My take is the following that you may or may not be able to slow down the mirror motor, but you may also induce some problems of accuracy/wobble at the same time, at least I feel that is possible.
It is maybe possible to slow down the motor by 50% without altering accuracy and repeatability too much......but more may be a problem.
Then why not "scan" a line more than once? Would this not give the same effect?
Effectively, you need to move the pcb far slower (say 4 times slower) and simultaneously scan say 4 times for each line (just as an example, you may need to increase that number even more).
Its a perfect job for a PIC to my mind to control a stepper motor (suitably geared down to move the PCB exactly one line per step) after the 4 (for example) scans have been made.....
Well thats my 2 cents worth!!
Its a really interesting blog Guys, many thanks.
All have a great day.
Regards
Andy
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