A FOCUSING TECHNIQUE FOR RASTER INPUT SCANNERS USING SENSOR ARRAYS
Original Publication Date: 1982-Oct-31
Included in the Prior Art Database: 2004-Apr-04
Xerox Disclosure Journal
A typical raster input scanner uses a CCD image sensor array and a 5 to 1OX object to image reduction lens system. The focusing of the image onto the sensor array is quite critical and is very time consuming. Typically, one looks at the output of the sensor array on an oscilloscope and tries to maximize the signal output cor-responding to a test pattern. This method is not very precise and can be time consuming. A technique is proposed here which can be both fast and precise.