Patent ID: 8913314

Claim:
A scanning device that scans a beam emitted from a light source, the scanning device comprising: a beam condensing unit that condenses the beam emitted from the light source; a beam diverging unit that is arranged on an output side of the beam condensing unit, and diverges the beam condensed by the beam condensing unit; a first scanning unit that is arranged between the beam condensing unit and the beam diverging unit, and scans the beam condensed by the beam condensing unit; a moving unit that moves at least one of the beam condensing unit and the beam diverging unit along respective optical axis directions thereof, in accordance with a scan angle of the first scanning unit; a polarizing beam splitter that is arranged between the beam condensing unit and the first scanning unit; and a ¼ wavelength plate that is arranged between the polarizing beam splitter and the first scanning unit.