| 摘要 |
PROBLEM TO BE SOLVED: To provide an image projection device capable of reducing deterioration of optical performance more inexpensively.SOLUTION: An image projection device comprises: a housing 14; and projection optical systems 2, 3 including a concave mirror 3 and for projecting an optically conjugate image of an object to a projected surface 4. In the image projection device, the entirety of the projection optical systems 2, 3 is housed inside the housing 14. The housing 14 has a hollow portion. The hollow portion is provided with a first opening 5 thorough which projection light reflected by the concave mirror 3 passes, and the first opening 5 has at least one end located within the hollow portion and is inclined relative to a second opening which is an opening of the hollow portion formed nearer to a side of the projected surface 4 than the first opening 5. |
