An image scanning device is provided which includes a system for determining the distance to a target to be scanned. The image scanning device includes an optical system and an image sensor array for focusing a light beam and imaging the target. The device preferably includes an automatic focusing system...http://www.google.com/patents/US20040118919?utm_source=gb-gplus-sharePatent US20040118919 - Image scanning device having a system for determining distance to a target
