CHAPTER 4 IMAGE FORMATION SYSTEMCOPYRIGHT © 1999 CANON INC. CANON NP6317 REV.0 APR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 4-11V. DOCUMENT DENSITY MEASUREMENT SYSTEMA. OutlineThere is an automatic density adjustment (AE) system which adjusts the DC component of thedeveloping bias to suit the density of the original. If the density of the original is more or lessuniform, the AE function varies the DC component of the developing bias to suit the density of theoriginal, so that copies of the correct density will be made.B. OperationThe scanner moves forward approximately 70 mm past the leading edge of the original andstops momentarily. The scanning lamp goes ON for approximately 1 sec, the image density is readby the AE sensor, and the sensor output is interpreted by the DC controller. The DC controller thenadjusts the DC component of the developing bias accordingly.Figure 4-501Approx. 65mm B5 A4Approx.30mmApprox.70mmApprox.25mmApprox.25mmApprox.28mmB6 (reference only)Note:A is the position of the AE sensorApprox.30mmA
