Focus adjusting system of an optical scanner

摘要

A focus adjusting system of an optical scanner which comprises an optical scanning module having a focus for scanning line images of a document line by line and converting each of the line images into a digital image signal set, and a scanning driver for driving the scanning module back and forth so as to scan the document. The focus adjusting system comprises a focus driver for adjusting the focus of the scanning module, and a focus controller for controlling the focus driver according to the digital image signal sets generated by the scanning module at various foci over a line position of the document so as to adjust the focus of the scanning module.