| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an image projection device equipped with a holding structure reduced in deviation of positional relation between a projection image and a reflection surface even when performing the tilt adjustment of a reflection type optical element. <P>SOLUTION: The image projection device has the holding structure for holding and fixing the reflection type optical element 6 so that an angle is adjustable. The reflection type optical element has guide shafts 11 and 12 having an axial center in a first direction orthogonal to a center optical axis of a projection image screen and parallel with one side of the projection image screen on an outer periphery part, the guide shafts rotatably held in groove parts 21 and 22 provided in a first holding member 20. The first holding member 20 has guide shafts 24 and 25 provided in a second direction orthogonal to the first direction and having an axial center orthogonal to the center optical axis of the projection image screen on an outer periphery part, the guide shafts rotatably held in groove parts 31 and 32 provided in a second holding member 30. The axial centers of the guide shafts of the reflection type optical element and the guide shafts of the first holding member are made to come into contact with a point where the reflection surface of the reflection type optical element and the center optical axis of the projection image screen cross each other. <P>COPYRIGHT: (C)2011,JPO&INPIT |
