Patent ID: 7954964

Claim:
A projector comprising: a projection optical device that magnifies and projects image light; and a projection position adjusting device that moves the projection optical device in a plane orthogonal to a projecting direction and adjusts a projection position of the projection optical device, wherein the projection position adjusting device includes: a first moving plate that supports the projection optical device and moves in a first direction and a second direction orthogonal to each other in the plane orthogonal to the projecting direction; a second moving plate that engages with the first moving plate and moves in the second direction together with the first moving plate; adjusting and driving units that move the first moving plate and the second moving plate; and a fixed member that is fixed in the projector and supports the moving plates and the adjusting and driving units, the adjusting and driving unit include: a pair of worms that have a columnar shape and have threads on outer circumferences thereof; and a pair of sliders that are screwed in the pair of worms, respectively, and move in an extending direction of the worms according to the rotation of the worms, the pair of worms are disposed to extend along the first direction or the second direction, one of the sliders engages with one of the moving plates to move in the extending direction of the worms together with the one moving plate, and engaging structures including inclining engaging holes that extend in a direction crossing the direction in the plane orthogonal to the projecting direction and engaging projections inserted through the inclining engaging holes are provided in the other slider and the other moving plate.