| 摘要 |
<p>An optical scanner device (100) for producing machine-readable data representative of an image (260) of a scan line object (206), comprising: a light source (180, 184) for illuminating the scan line object (206); a lens assembly (164) for focusing imaging light received from the scan line object on an image plane (XX); at least one mirror (212, 214, 216) having a planar mirror surface (215, 217, 219) for reflectively directing imaging light from the scan line object (206) into the lens assembly (164) whereby a folded imaging light path (210) extending between the scan line object (206) and the lens assembly (164) is provided; and an occluding aperture stop (201) positioned in immediately adjacent, overlying relationship with the mirror surface (217) for selectively differentially blocking light in the light path (210) emanating from different points across the scan line object (206) for adjusting the light intensity of the image (260) produced on the image plane (XX) whereby blocking of light with the occluding aperture stop (201) at more than one location along the folded imaging light path (210) is obviated. Alternative embodiments utilizing a gradient filter and a shaped mirror surface are also disclosed. <IMAGE></p> |
