Projector, image projection method, and head-up display device using the projector

A projector which projects an image corresponding to an original image on a projection object by scanning the projection object with a light beam, comprising:

• a light source configured to emit a light beam;
• a projection optical system including:
• a divergence angle converter configured to convert a divergence angle of the light beam so that focused spots are formed on the projection object;
• and
• a light deflector configured to deflect the light beam from the divergence angle converter in a light beam scanning direction and a direction perpendicular to the light beam scanning direction to form the focused light spots on pixel portions of the projection object such that positions of the pixel portions correspond to positions of pixels of the original image;
• a light deflector drive controller configured to control the light deflector to form the focused light spots on the pixel portions of the projection object on the basis of positional data of the pixels;
• a light amount controller configured to control light amount of the light beam emitted by the light source on the basis of luminance data for the pixels;
• and
• an image processor configured to correct the luminance data for each pixel on the basis of previously obtained data concerning deterioration in quality of the projected image and to output the corrected luminance data to the light amount controller while outputting the positional data to the light deflector drive controller.