ADJUSTMENT METHOD FOR AN IMAGE PROJECTION DISPLAY DEVICE AND AN IMAGE PROJECTION DISPLAY DEVICE
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United States of America Patent
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Issued Date -
May 29, 2008
app pub date -
Jun 29, 2007
filing date -
Jun 30, 2006
priority date (Note) -
Abandoned
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Abstract
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 the position of an image on the flat screen is adjusted without varying a projection distance between the image-projection optical unit and the flat screen.
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