| 摘要 |
<p>The projection lens shifting mechanism is provided for projecting a light beam from a light source onto a screen through a projection lens to make an enlarged projection of an image rendered on a display device. The mechanism serves for locating the projected picture at a desired position on the screen by shifting the projection lens with respect to the display surface of the display device. The mechanism includes a base plate, a moveable plate and a holding plate. The base plate is secured to the housing of the projection lens shifting mechanism and has a guide surface parallel to the display surface of the display device. The moveable plate rigidly holds the projection lens and can move in a prescribed direction parallel to the display surface of the display device guided by the guide surface of the base plate when in a moveable state. The holding plate is linked to the moveable plate through elastic members and, together with the moveable plate, constitutes an elastic clamp structure that holds the base plate on both sides and elastically clamps the base plate by means of the elastic force of the elastic members. When an external force works against the elastic force to release this clamp, the holding plate assumes a moveable state and can move integrally with the moveable plate in a direction parallel to the guide surface of the base plate. <IMAGE></p> |
