| 摘要 |
<p>PURPOSE:To accurately and easily incline an original image at the desired angle to be mounted by directly measuring the original image angle by means of an imaging optical system installed at a position opposing to an original image installation part. CONSTITUTION:A projection optical system 32 possessing a projection lens 34 and a screen plate 39 is installed at the position opposing to the original image installation part, and the original image placed on the original image installation part is formed on the screen plane using a projection lens 34. The screen plate 39 with a suitable bench mark 40 is installed so that it rotates around the optical axis, and an angle scale 41 capable of measuring the rotational angle with a reference where the bench mark 40 is in parallel to the reference line of a scanning device is installed on the rotation holding part 36 of the screen plate 39. Then the bench mark of the screen plate is inclined at the desired original image inclination angle, and the original image is installed so that the edge image of the projecting image original is coincident with the bench mark. Thus, the original image is correctly mounted at the desired inclination angle.</p> |
