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(12) United States Patent Nakazato et al. US006400917B2 (10) Patent N0.: (45) Date of Patent: US 6,400,917 B2 Jun. 4, 2002 (54) IMAGE FORMING APPARATU

US 6,400,917 B2 22b 6 3 f b M I v 8 t w 0 % g . I U 0 F s 2 m o m. m 4, n. u J C O 3 3 U.S. Patent 220 330 202 2800 F i 9. I4

U.S. Patent Jun. 4, 2002 Sheet 14 0f 36 US 6,400,917 B2 Fig. 2/ 104K’ HIK \ g Lb 106K IOBKV '_' 4 EEK”

US 6,400,917 B2 U.S. Patent Jun. 4, 2002 SCANNING F i g. 24 SUB SCANNING 8K Lb

U.S. Patent Jun. 4, 2002 Sheet 16 0f 36 US 6,400,917 B2 Fig. 258

U.S. Patent Jun. 4, 2002 Sheet 17 0f 36 US 6,400,917 B2 [22 Fig.2? 22c p/ Lb m???) 300(30) Fig.28 22e

U.S. Patent Jun. 4, 2002 Sheet 18 0f 36 US 6,400,917 B2

U.S. Patent Jun. 4, 2002 Sheet 19 0f 36 US 6,400,917 B2 Fig.3] 22b / / / / / / /I/ //J/ / Z / / / \ - l.______ . I / 1 1 77/ / / 1 ' 220

U.S. Patent Jun. 4, 2002 Sheet 7 0f 36 US 6,400,917 B2 Fig.8 30(300)