| 摘要 |
PROBLEM TO BE SOLVED: To provide an image projection device capable of reducing deterioration of optical performance at a lower cost.SOLUTION: An image projection device includes a housing, and a projection optical system having a concave mirror and projecting an image conjugate with an object toward a projection target surface. The projection optical system is accommodated entirely inside the housing, and the housing includes a dent. The dent includes a first opening for passing a projection light beam reflected on the concave mirror; and the first opening is inclined relative to a second opening that is an opening of the dent formed closer to the projection target surface than the first opening. |
