| 摘要 |
An adjustment method for an image-projection display device, in which an image-projection optical unit, a flat screen, and a mirror are provided, and with the method a bundle of light rays emitted from the image-projection optical unit is bent by the mirror so that a principal light ray, of a bundle of light rays being incident on the center of the flat screen, is made incident on the flat screen at an oblique angle; and the adjustment method comprising steps of, moving one of the image-projection optical unit in the direction orthogonal to the flat screen and the mirror in at least a direction parallel to the flat screen or a direction orthogonal to the flat screen; and moving the other of the image-projection optical unit in the direction orthogonal to the flat screen and the mirror in at least a direction parallel to the flat screen or a direction orthogonal to the flat screen; whereby a projection distance between the image-projection optical unit and the flat screen is adjusted without varying the position and direction of the principal light ray before and after adjustment.
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