Patent ID: 8569727

Claim:
A light beam scanning image projection apparatus comprising: a plurality of light sources which emit light beams of respectively different wavelengths; a driving section which modulates an intensity of said each light beam in accordance with an image signal; a light axis alignment device which aligns light axes of said each light beam; and a scanning device which scans said each light beam, wherein the light axis alignment device includes: a plurality of optical elements; and an adjusting section which adjusts at least one of a position and a gradient of at least one of the optical elements, and the light beam scanning image projection apparatus further comprises: a detecting device which detects a shift between a spot center of said each light beam and a center reference point; and a position correction device which controls the adjusting section based on a detection result in the detecting device to adjust at least one of the position and the gradient of at least one of the optical elements of the light axis alignment device, thereby aligning the light axes of said each light beam, wherein said light axis alignment device has an optical system which collects the plurality of light beams generated from said each light source at one axis, said optical system includes at least a lens, and said position correction device controls said adjusting section to change a position and a gradient of at least the lens of the optical system, thereby adjusting a propagation direction of said each light beam.