Optical scanning device, projection device, and display device

An optical scanning device comprising:

• a light source to emit a light beam;
• a scanning member to deflect the light beam emitted from the light source to cause the deflected light beam to two-dimensionally scan a scanning area in a first direction and a second direction perpendicular to the first direction;
• and
• an incident optical system to guide the light beam emitted from the light source to the scanning member, the incident optical system including the light source and an optical element,
• wherein the scanning area includes a first area and a second area surrounding the first area, the first area being an image-forming area in which an intermediate image is formed and the second area being a non-image-forming area in which no intermediate image is formed,
• wherein, when the scanning area is viewed from a side of the scanning member, the scanning area is divided into two divided areas by a line segment parallel to the first direction, and at least a part of a component that constitutes the incident optical system is disposed in an area of the second area that overlaps one of two divided areas of the scanning area, and
• wherein the at least the part of the component that constitutes the incident optical system is disposed between the scanning member and the scanning area along a scanning optical path such that the light beam in the scanning optical path intersects the at least the part of the component that constitutes the incident optical system, the scanning optical path being an optical path in which the light beam deflected by the scanning member travels to the scanning area when the scanning member scans.