Optical scanning apparatus, image projecting apparatus, and mobile object

An optical scanning apparatus comprising:

• a light source configured to emit light;
• a light deflector configured to deflect the light emitted from the light source at least in a sub-scanning direction to perform optical scanning on a scan region,
• wherein the light deflector includes a micro electromechanical system device,
• wherein the micro electromechanical system includes a reflection surface that moves at least either monoaxially or biaxially in a reciprocal manner based on a drive signal from a controller;
• a light receiver configured to receive, within a predetermined range in the sub-scanning direction, the light used for optical scanning performed by the light deflector;
• and
• the controller, wherein the controller is configured to
• calculate a time difference between a first time at which the light receiver receives the light at a first position and a second time at which the light receiver receives the light at a second position, the first and second positions being the most distant positions from each other in the sub-scanning direction within the predetermined range,
• compare the time difference to a predetermined value, and
• adjust the drive signal when the time difference is greater than the predetermined value.

An image projecting apparatus comprising:

• an optical scanning apparatus including
• a light source configured to emit light,
• a light deflector configured to deflect the light emitted from the light source at least in a sub-scanning direction to perform optical scanning on a scan region,
• wherein the light deflector includes a micro electromechanical system device,
• wherein the micro electromechanical system includes a reflection surface that moves at least either monoaxially or biaxally in a reciprocal manner based on a drive signal from a controller,
• a light receiver configured to receive, within a predetermined range in the sub-scanning direction, the light used for optical scanning performed by the light deflector, and
• the controller, wherein the controller is configured to
• calculate a number of times that the light is received by the light receiver,
• compare the number of times that the light is received by the light receiver to a predetermined value, and
• adjust the drive signal when the number of times that the light is received by the light receiver is greater than the predetermined value;
• and
• a projection optical system configured to project light emitted from the optical scanning apparatus to the scan region,
• wherein the light deflector of the optical scanning apparatus scans, with light that is modulated based on image information, the scan region to project an image.