| 摘要 |
PURPOSE:To reduce a vignetting generated by a Fresnel lens with a luminous flux from an original picture by placing a field lens by shifting it from the position of an image of the first image forming optical system forming an intermediate image of the original picture. CONSTITUTION:By the first optical means 12 for projecting an original picture 11, and the second optical means 15 for forming its projected image on a read means 16, a magnified image of said original picture 11 is formed on the read means 16, and also a Fresnel lens 13 operated as a field lens placed between said first optical means 12 and the second optical means 15 is placed by shifting it from a position 14 where the image of the original picture 11 is formed by the first optical means 12.
|
