Patent ID: 9488829
Filing Date: 2016-11-08
CPC Classification: G01J,G02B,H04N

Claim Text:
1. An optical scanning device comprising: a first scanning driving unit including a scanning mirror, and a frame structure supporting the scanning mirror, the first scanning driving unit being configured to cause the scanning mirror to rotate about a first rotation axis by means of deformation of the frame structure; a second scanning driving unit including a rotation holder supporting the first scanning driving unit, and a supporting shaft that rotatably supports the rotation holder about a second rotation axis perpendicular to the first rotation axis, the second scanning driving unit being configured to cause the rotation holder to rotate about the second rotation axis; a light source that emits light; an incident-side optical element that guides the light emitted by the light source to the scanning mirror; an emission-side optical element that guides reflected light reflected by the scanning mirror to a projection surface, and a photodetector mounted to the emission-side optical element, the photodetector detecting a part of the reflected light, wherein the photodetector includes quadrant optical detectors provided at a center of an incident surface and a plurality of positions corresponding to both ends of the incident surface in a direction of scanning by the first scanning driving unit and both ends of the incident surface in a direction of scanning by the second scanning driving unit.