Laser scanning device and calibration method thereof

A calibration method for a laser scanning device, the laser scanning device scanning at least a light reflective object in a predetermined scan region, the laser scanning device comprising:

• at least a light-emitting element for emitting laser beams in a laser emitting direction;
• at least an oscillating reflective element disposed in the laser emitting direction and swinging back and forth in an oscillation frequency in a predetermined angle range such that the predetermined scan region is scanned by the laser beams;
• at least a light receiving element for receiving the laser beams reflected by the oscillating reflective element;
• and a micro processing unit for driving the oscillating reflective element and is electrically connected with the light receiving element, the micro processing unit storing a standard light quantity range value and a plurality of compensation values, wherein the plurality of compensation values are used to compensate the oscillation frequency of the oscillating reflective element in different environment temperatures, the calibration method comprises the following steps:
• a) generating a light quantity value based on the laser beams received by the light receiving element;
• b) determining whether the light quantity value conforms to the standard light quantity range value or not;
• c) if the light quantity value does not conform to the standard light quantity range value, directly selecting one of the plurality of compensation values that corresponds to the current environment temperature by the micro processing unit;
• and
• d) adjusting the oscillation frequency of the oscillating reflective element based on the compensation value such that the light quantity value of the laser beams received by the light receiving element conforms to the standard light quantity range value.