Active type rotary flat mirror scanner

The invention relates to an active type rotary flat mirror scanner, in which, a controllable motor is fixed on a motor fixing frame; a mechanical coding disc and a rear balance weight is fixed to the rear end of the motor shaft by pins; a slip ring is connected to the front end of the motor shaft by the fixing frame; a front balance weight on the front end of the motor shaft is fitted with the keyway on the motor shaft by a positioning key, and is stopped by an extra axial stopping screw; a scanning reception mirror is connected with the motor shaft by a 45 degrees connection block; a verticalthrough hole is formed on the 45 degrees connection block and the scanning reception mirror together; the collimator lens barrel of a light source module is inserted into the through hole, and is connected with the motor shaft by the 45 degrees connection block; while the reflecting surface center of the scanning reception mirror is on the central axis of the light source module; and the light source rotates along the sc