An optical scanner device for producing machine-readable data representative of an image of a scan line object, comprising: a light source for illuminating the scan line object; a lens assembly for focusing imaging light received from the scan line object on an image plane; at least one mirror having...http://www.google.com/patents/US5019703?utm_source=gb-gplus-sharePatent US5019703 - Optical scanner with mirror mounted occluding aperture or filter
