Electrophotography – Image formation – Development
Reexamination Certificate
2011-02-15
2011-02-15
Gray, David M (Department: 2852)
Electrophotography
Image formation
Development
C399S274000, C399S272000
Reexamination Certificate
active
07890028
ABSTRACT:
A developing device and image forming apparatus that can satisfy stability over time in relation to amount of developer carried, and prevent developer retention, deterioration of developer and developing sleeve adhesion, wherein the amount of developer carried per unit area on the developer carrier in the developing region is 30 mg/cm2to 60 mg/cm2; the weight mean particle diameter of the toner is 4.5 μm to 8.0 μm; the ratio Dw/Dn of the toner weight mean particle diameter (Dw) and the number mean particle diameter (Dn) is 1.20 or less; an irregular roughness pattern having the maximum height Rz of the surface roughness of 20 to 40 μm and the mean space Sm of the roughness of 100 to 200 μm is formed on the surface of the developer carrier; and the relationship between the developing gap PG and the gap DG between the developer restricting member and the developer carrier is 1.0≦(DG/PG)≦3.0.
REFERENCES:
patent: 5380616 (1995-01-01), Aoki et al.
patent: 5659860 (1997-08-01), Sasaki et al.
patent: 5758241 (1998-05-01), Oyama et al.
patent: 5771426 (1998-06-01), Oka et al.
patent: 5771429 (1998-06-01), Oyama et al.
patent: 5805965 (1998-09-01), Tsuda et al.
patent: 5822664 (1998-10-01), Oka et al.
patent: 5840456 (1998-11-01), Tomita et al.
patent: 5878313 (1999-03-01), Takagi et al.
patent: 5915155 (1999-06-01), Shoji et al.
patent: 5919592 (1999-07-01), Yaguchi et al.
patent: 5998074 (1999-12-01), Miyamoto et al.
patent: 5999772 (1999-12-01), Kakitani et al.
patent: 6198895 (2001-03-01), Tsuda et al.
patent: 6337957 (2002-01-01), Tamaki et al.
patent: 6355389 (2002-03-01), Miyamoto
patent: 6432590 (2002-08-01), Ueda et al.
patent: 6522855 (2003-02-01), Katoh et al.
patent: 6593048 (2003-07-01), Sasaki et al.
patent: 6667141 (2003-12-01), Iwamoto et al.
patent: 6699632 (2004-03-01), Higuchi et al.
patent: 6790575 (2004-09-01), Sasaki et al.
patent: 6835517 (2004-12-01), Kondo et al.
patent: 6856774 (2005-02-01), Sampe et al.
patent: 6856781 (2005-02-01), Matsuda et al.
patent: 6873814 (2005-03-01), Ohjimi et al.
patent: 6911289 (2005-06-01), Higuchi et al.
patent: 6924073 (2005-08-01), Higuchi et al.
patent: 6934484 (2005-08-01), Suzuki et al.
patent: 6947692 (2005-09-01), Kondo et al.
patent: 7003255 (2006-02-01), Kawasumi et al.
patent: 7024133 (2006-04-01), Nagashima et al.
patent: 7056636 (2006-06-01), Tomita et al.
patent: 7062207 (2006-06-01), Tsuda et al.
patent: 7072602 (2006-07-01), Hatori et al.
patent: 7076192 (2006-07-01), Tsuda et al.
patent: 7083890 (2006-08-01), Emoto et al.
patent: 7129013 (2006-10-01), Higuchi et al.
patent: 7136610 (2006-11-01), Arai et al.
patent: 7146122 (2006-12-01), Hatori et al.
patent: 7157199 (2007-01-01), Emoto et al.
patent: 7157201 (2007-01-01), Tomita et al.
patent: 7162189 (2007-01-01), Tsuda et al.
patent: 7169525 (2007-01-01), Sugiura et al.
patent: 7172844 (2007-02-01), Umemura et al.
patent: 7184691 (2007-02-01), Kita et al.
patent: 7212767 (2007-05-01), Hosokawa et al.
patent: 7258959 (2007-08-01), Nakayama et al.
patent: 7261989 (2007-08-01), Sugiura et al.
patent: 2003/0178514 (2003-09-01), Makino et al.
patent: 2004/0223790 (2004-11-01), Hosokawa et al.
patent: 2004/0265015 (2004-12-01), Koike et al.
patent: 2005/0002701 (2005-01-01), Ikeguchi et al.
patent: 2005/0026064 (2005-02-01), Sugiura et al.
patent: 2005/0089786 (2005-04-01), Sugiura et al.
patent: 2005/0089787 (2005-04-01), Uchinokura et al.
patent: 2005/0141919 (2005-06-01), Kitajima et al.
patent: 2005/0158644 (2005-07-01), Kondo et al.
patent: 2005/0181291 (2005-08-01), Kami et al.
patent: 2005/0191575 (2005-09-01), Sugiura et al.
patent: 2005/0208408 (2005-09-01), Uchinokura et al.
patent: 2005/0208411 (2005-09-01), Nakayama et al.
patent: 2005/0226656 (2005-10-01), Tsuda et al.
patent: 2006/0029433 (2006-02-01), Saito et al.
patent: 2006/0051136 (2006-03-01), Tsuda et al.
patent: 2006/0057479 (2006-03-01), Niimi et al.
patent: 2006/0083555 (2006-04-01), Uchiyama et al.
patent: 2006/0093946 (2006-05-01), Miyamoto et al.
patent: 2006/0099009 (2006-05-01), Miyamoto et al.
patent: 2006/0120767 (2006-06-01), Miyamoto et al.
patent: 2006/0134540 (2006-06-01), Kondo et al.
patent: 2006/0154168 (2006-07-01), Tomita et al.
patent: 2006/0177749 (2006-08-01), Tamoto et al.
patent: 2006/0204883 (2006-09-01), Nakayama et al.
patent: 2007/0020546 (2007-01-01), Emoto et al.
patent: 2007/0031748 (2007-02-01), Kotsugai et al.
patent: 2007/0081835 (2007-04-01), Tsuda et al.
patent: 2007/0116494 (2007-05-01), Uno et al.
patent: 2007/0140747 (2007-06-01), Kita et al.
patent: 2007/0160392 (2007-07-01), Tsuda et al.
patent: 2000-75541 (2000-03-01), None
patent: 2002-91053 (2002-03-01), None
patent: 2002-258609 (2002-09-01), None
patent: 2003-177602 (2003-06-01), None
patent: 2004-109284 (2004-04-01), None
patent: 2005-37878 (2005-02-01), None
patent: 2005-62476 (2005-03-01), None
patent: 2006-23783 (2006-01-01), None
patent: 2006-47942 (2006-02-01), None
U.S. Appl. No. 12/059,392, filed Mar. 31, 2008, Takeyama, et al.
U.S. Appl. No. 12/110,055, filed Apr. 25, 2008, Sakata, et al.
U.S. Appl. No. 12/114,164, filed May 2, 2008, Matsumoto, et al.
U.S. Appl. No. 12/166,951, filed Jul. 2, 2008, Miyamoto, et al.
U.S. Appl. No. 09/148,509, filed Sep. 4, 1998, Yohtaro Kakitani, et al.
U.S. Appl. No. 09/384,797, filed Aug. 27, 1999, Satoru Miyamoto, et al.
U.S. Appl. No. 10/793,320, filed Mar. 5, 2004, Hiroto Higuchi, et al.
U.S. Appl. No. 11/612,865, filed Dec. 19, 2006, Kiyonori Tsuda, et al.
U.S. Appl. No. 12/194,649, filed Aug. 20, 2008, Kita, et al.
U.S. Appl. No. 12/235,135, filed Sep. 22, 2008, Kato, et al.
U.S. Appl. No. 12/238,815, filed Sep. 26, 2008, Utsunomiya, et al.
U.S. Appl. No. 12/250,046, filed Oct. 13, 2008, Tsuda.
U.S. Appl. No. 12/252,693, filed Oct. 16, 2008, Sakata.
Koeda Maiko
Miyamoto Satoru
Sakata Koichi
Tsuda Kiyonori
Gray David M
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
Ricoh & Company, Ltd.
Yi Roy
LandOfFree
Developing device and image forming apparatus comprising the... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Developing device and image forming apparatus comprising the..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Developing device and image forming apparatus comprising the... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2634977