A laser scanning unit mainly includes a semiconductor laser,a collimator,a micro electronic mechanic system (MEMS) oscillatory mirror, and an fθ lens or an f sin θ lens. The laser scanning unit MEMS oscillatory mirror is disposed between the collimator and the fθ lens to replace a conventional laser scanning unit rotary polygonal mirror for controlling a direction in which laser beams are projected from the oscillatory mirror to the fθ lens. With the laser scanning unit MEMS oscillatory mirror, the cylindrical lens may be omitted from the laser scanning unit and noises produced by the polygonal mirror rotating at high speed may be avoided. Moreover, the MEMS oscillatory mirror allows bi-directional laser scanning unit to therefore enable increased scanning frequency, simplified laser scanning unit structure, and improved laser scanning unit efficiency.

A laser scanning unit in which scanning lines incident parallel onto a photoreceptor have the same scanning direction. The laser scanning unit includes: a driving source for providing a laser scanning unit rotatory force; a deflection disk installed around a rotary shaft of the driving source having a plurality of laser scanning unit sectors each with a hologram pattern for diffracting and deflecting incident light, for laser scanning unit light through rotation; a plurality of laser scanning unit light sources installed facing one laser scanning unit surface of the deflection disk for irradiating a plurality of laser scanning unit light lines onto predetermined points of the deflection disk; and a laser scanning unit light path changing portion for changing traveling paths of the plurality of scanning lines formed by the rotation of the deflection laser scanning unit disk, wherein the plurality of laser scanning unit light sources are arranged such that two incident points which are the farthest from each other among the plurality of incident laser scanning unit points formed on the deflection laser scanning unit disk form 180° with the center point of the deflection disk.

Laser scanning unit is a non-contact technology that digitally captures the shape of physical objects using laser scanning unit light. A laser scanning unit probe projects a line of l laser scanning unit light onto a surface while cameras continuously triangulate the changing distance and shape of the laser scanning unit line as it sweeps along, digitizing the object in three dimensions (see below for more information about laser triangulation).

Laser scanning unit is an active stereoscopic measurement technique that computes the distance of an object with a directional laser scanning unit light source and a video camera.A laser scanning unit beam is deflected from a mirror onto a scanning object.