Laser Direct Imaging test with 405nm Laser. HD

This is a crude setup to measure motor jitter from a laser scanning unit from a xerox copier. Some specifics about the polygon mirror scanner: The driver on the board is a LB1870 the datasheet can easely be found online. What I have done is looked at the datasheet and PCB (single layer on a metallic substrate) and reverse engineered the connections. They are as follows: Header is 2mm pitch. 1: VCC (24V) 2: VCC 3: GND 4: GND 5: Start / Stop 6: N1 / Divisor switch 1, probably for two DPI settings 7: LD / Lock Detect The spot size is less then optimal but that is due to a damaged laser removed from a PHR803 carriage. The front glass of the laser diode is loose and wiggles around the laser package. I do have some new 20mw diodes coming up, ready for usage. The big ATX cased powersupply is a 24V and 5V powersupply. The powersupply board is made by meanwell and is pretty common here (the netherlands) on the surplus market. It is a pretty good powersupply and the 24V is mandatory for the polygon mirror motor driver. The overall scan jitter is around 50ns. Pretty accurate if you ask me. Creating a homebrew LDI system for exposing circuitboard seems in my reach. Next steps will be: * Fixing the laser mechanics with sturdy mounting and reusing the adjustable lens with beam shaper. This would improve beamquality. * create a high speed laser modulator (1mhz) and a scheme to sync the beam with the motor rotation by using the optical feedback sensor (the scope trace output). There is a flickr photostream with some pictures here: http://www.flickr.com/photos/98835706@N00/5396599062/in/set-72157625407033197/ Here is a schematic of a binarty laser modulator circuit: http://www.repairfaq.org/sam/laserdps.htm#dpshp1