In the present invention, the module is manufactured in the form of an open top, and then the collimating lens, which is exposed at the top, is moved in a sliding manner to adjust the optical axis distance, thereby facilitating the adjustment of the optical axis distance and improving the fabrication of the module And more particularly to a module body having a laser diode for scanning a beam, a collimating lens for converting the scanned beam into parallel light, and a slit for passing only part of the beam passed through the collimating lens, Wherein the slit is coupled to the front side of the collimating lens, the slit is coupled to the front side, and a slider having a long adjustment hole in the direction of the optical axis is provided at the center, a guide rail opened upward is formed in the optical axis direction, With the slider in place, the adjustment screw is tightened through the adjustment hole And the laser diode is coupled to the rear of the guide rail.
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