Chapter 55-12to the tube axis, while the inner side is coated with fluorescent material. When high-frequency high voltage is applied to the electrodes, the gas inside the tube startsto discharge, thus illuminating the fluorescent material.F-5-225.3.3.4 Controlling the Activation 0010-7895iR7105 / iR7095 / iR7086The machine turns on or off the scanning lamp using the drive signal (XE_ON) from the CPU on the reader controller PCB. In response to the signal, the inverterPCB generates high-frequency high voltage in the activation control circuit using the drive voltage (+24 V) supplied by the reader controller PCB, thus turning onthe xenon lamp.5.3.4 Detecting the Size of Originals5.3.4.1 Overview 0010-7897iR7105 / iR7095 / iR7086The machine identifies the size of an original with reference to the combination of measurements taken of the light reflected at specific points of the CCD and theoutput of a reflection type sensor. It takes measurements at 2 points for individual sizes to ensure correct identification even in the event that the original is displacedwhile the ADF is being closed.- for main scanning direction, by the CCD (for AB, 8 points; for inch-configuration, 6 points)- for sub scanning direction, by a reflection type photosensor (for AB-configuration, 1 point; for inch-configuration, 1 point)The machine identifies the size of an original as follows:1) External Light (main scanning direction only)While keeping the scanning lamp off, the machine measures the CCD level at individual points of measurement in main scanning direction.2) Sensor Output LevelThe machine turns on the scanning lamp, and measures the CCD level at individual points of measurement in main scanning direction. Also, the machine turnson the LED of the reflection type photosensor in sub scanning direction to measure the sensor output. It uses the combination of the measurement and the outputto identify the size of the original in question.5.3.4.2 Points of Measurement Used for Original Size Identification 0010-7898iR7105 / iR7095 / iR7086For main scanning direction, the machine moves the No. 1 mirror base to the point of CCD original detection to measure the CCD level at individual points ofmeasurement. For sub scanning direction, the machine uses the outputs of original sensors 1 and 3.F-5-231. Checking the Presence/Absence of an Original at 2 Points (individual points of detection)For main scanning direction, the machine identifies the presence/absence of an original with reference to the CCD output at 2 points (nearest).FluorescentmaterialElectrodeOpeningElectrodeElectrodeElectrodeGlass tubePoint of originaldetection 3Point of originaldetection 4Point of originaldetection 1Print of originaldetection 2B5B6A5A4B5RA4RB4A3CCD original detection positionPoint of originaldetection 2Point of originaldetection 1Point of originaldetection 3LTRRSTMTLTRLGL279.4×431.8mm(11"×17")CCD original detection positionOriginalsensor 3AB-Configuration Inch-configurationSTMTROriginalsensor 1
