CHAPTER 3 EXPOSURE SYSTEMCOPYRIGHT © 1999 CANON INC. CANON NP6512/6612/7120/7130/7130F REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 3-1ItemLampScanningScanner position detectionRatio variationLens drive controlScanner drive controlProtective functionDescriptionHalogenBy moving the No. 1 mirror mountBy a sensor (scanner home position sensor; PS1)Main scanning direction:by varying the optical lengthSub scanning direction:by varying the speed of the No. 1 mirror mountScanner/lens drive motor (M2)Fixed focal point lens unitMobile No. 4/5 mirror unitScanner/lens drive motor (M2)Scanner thermistor (TH2)By a fuse (blows in response to overheating of the scanning lamp to cutpower to the lamp)• Thermal fuse (FU1; blows at 128°C)Table 3-101Figure 3-101PhotosensitivedrumFixed focal point lensEnlarge Reduce Moves for enlargement/reductionNo. 4/5 mirror unitCopyboard glassI. OPERATIONSA. OutlineTable 3-101 shows the major functions of the exposure system.
