This is the optic module from a laser printer, in wich are mounted a 35mW green laser and a photodiode used for end-of-cycle detection. A microcontroller (PIC 18F2455) regulates via PWM the rotation speed of the hexagonal mirror so that it gets a 200hz frequency on the end-of-the-line photodiode. It also pulses the laser in phase to get 12 beams.
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