| 摘要 |
<p>PROBLEM TO BE SOLVED: To perform appropriate focus correction by determining a state of an image projection device at start-up.SOLUTION: An image projection device comprises: time measuring means (an overall control part 10) for measuring illumination time of a light source; an internal temperature sensor 11 for measuring an internal temperature; an outside air temperature sensor 12 for measuring a temperature of outside air; correction amount determination measure (the overall control part 10) for determining focus correction amount on the basis of measurement results of the internal temperature sensor 11 and the outside air temperature sensor at start-up and a measurement result of the time measuring means; and a focus driving part 14 for performing focus correction of a projection optical system on the basis of the focus correction amount.</p> |
