| 摘要 |
<p>PROBLEM TO BE SOLVED: To accurately perform driving of respective projectors and an adjustment of an image screen, and prevent a keystoning phenomenon by simultaneously performing matching of three beams of red, green and blue and a focal adjustment by integrally driving three photographing lenses by using a single motor. SOLUTION: Three spherical surface reflecting mirrors 21a to 21c or the like are arranged in a case 20. Next, a holder housing 50 arranged inside so that three projection lens holdes can be integrally driven by a single driving means is provided. This is formed as a structure to make the three photographing lenses simultaneously move in the longitudinal direction and the lateral direction while maintaining the optical axes of projectors 29a to 29c and the optical axes Ld to Lf of projection lenses in parallel to the central axis of a screen. That is, while moving the three projection lens holders in the optical axis direction, the projection lens holders positioned on both left and right sides are simultaneously moved in parallel in the direction for going away from each other or approaching each other.</p> |
