One day we were playing with a Xbox blu-ray sled trying to turn the laser on and we thought: could the blu-ray laser be used to print circuit boards?
The sled has an ultraviolet laser diode and maybe we can sensitize dry-film or presensitized boards with it.
Eight months later we did it using the famous Toshiba PHR-803T blu-ray optical pickup.
The PHR-803T is a masterpiece of engineering manufactured by Toshiba. But nowadays optical storage technology has been largely superseded by other technologies like flash memories.
The pickup incorporates some interesting components:
Three laser diodes: UV 405nm (HD-DVD), Red 650nm (DVD) and IR 780nm (CD)
A focus lens and coil servos for auto-focus, tracking and correction angle.
A photodiode array which receive the RF signal and help also focusing on.
We took control of almost everything and we are using it to print PCBs at 600dpi.