Electrophotographic photosensitive member, process cartridge, and electrophotographic apparatus
| Title: | Electrophotographic photosensitive member, process cartridge, and electrophotographic apparatus |
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| Patent Number: | 9,256,145 |
| Publication Date: | February 09, 2016 |
| Appl. No: | 13/384852 |
| Application Filed: | September 03, 2010 |
| Abstract: | An electrophotographic photosensitive member that can not easily cause charging lines even where it is an electrophotographic photosensitive member employing as a conductive layer a layer containing metal oxide particles is disclosed. Also disclosed are a process cartridge and an electrophotographic apparatus which have such an electrophotographic photosensitive member. The electrophotographic photosensitive member has a conductive layer which contains titanium oxide particles coated with tin oxide doped with phosphorus or tungsten. |
| Inventors: | Fujii, Atsushi (Yokohama, JP); Tsuji, Haruyuki (Yokohama, JP); Matsuoka, Hideaki (Mishima, JP); Shida, Kazuhisa (Mishima, JP); Nakamura, Nobuhiro (Mishima, JP) |
| Assignees: | CANON KABUSHIKI KAISHA (Tokyo, JP) |
| Claim: | 1. An electrophotographic photosensitive member comprising: a support; a conductive layer formed on the support; and a photosensitive layer formed on the conductive layer, wherein the conductive layer contains a binding material, and titanium oxide particles coated with tin oxide doped with tungsten, and wherein a dielectric loss tan δ of the electrophotographic photosensitive member at a frequency of 1.0×10 3 Hz is from 5×10 −3 or more to 2×10 −2 or less. |
| Claim: | 2. The electrophotographic photosensitive member according to claim 1 , wherein the conductive layer has a volume resistivity of from 5.0×10 8 Ω·cm or more to 1.0×10 13 Ω·cm or less. |
| Claim: | 3. A process cartridge which integrally supports the electrophotographic photosensitive member according to claim 1 and at least one means selected from the group consisting of a charging means, a developing means, a transfer means and a cleaning means, and is detachably mountable to the main body of an electrophotographic apparatus. |
| Claim: | 4. An electrophotographic apparatus which comprises the electrophotographic photosensitive member according to claim 1 , and a charging means, an exposure means, a developing means and a transfer means. |
| Claim: | 5. The electrophotographic photosensitive member according to claim 1 , wherein the dielectric loss tan δ of from 5×10 −3 or more to 2×10 −2 or less is conducted by the conductive layer. |
| Patent References Cited: | 4941022 July 1990 Ohmura et al. 5171480 December 1992 Yoshinaka et al. 5357320 October 1994 Kashimura et al. 5385797 January 1995 Nagahara et al. 5422210 June 1995 Maruyama et al. 5455135 October 1995 Maruyama et al. 5468584 November 1995 Go et al. 5485250 January 1996 Kashimura et al. 5488461 January 1996 Go et al. 5853936 December 1998 Segi et al. 6156472 December 2000 Segi et al. 6372347 April 2002 Yamaguchi et al. 6709808 March 2004 Lelental et al. 6773856 August 2004 Tanaka et al. 7211357 May 2007 Hosoi et a 7245851 July 2007 Fujii et al. 7276318 October 2007 Fujii et al. 7333752 February 2008 Kawahara et al. 7407606 August 2008 Chiba et al. 7517626 April 2009 Fujii et al. 7732113 June 2010 Nakamura et al. 7910274 March 2011 Tanaka et al. 8088541 January 2012 Tanaka et al. 8227083 July 2012 Isobe et al. 2004/0023139 February 2004 Yoshimura et al. 2006/0208228 September 2006 Chiba et al. 2009/0136256 May 2009 Nakamura et al. 1462378 December 2003 1826665 August 2006 101400608 April 2009 0 609 511 August 1994 0 918 259 May 1999 1 647 997 April 2006 2-158789 June 1990 6-208238 July 1994 6-222600 August 1994 7-295270 November 1995 11-7145 January 1999 2003-131406 May 2003 2003-316059 November 2003 2004-101814 April 2004 2007-47736 February 2007 2009-58789 March 2009 2005/008685 January 2005 |
| Other References: | Derwent-abstract, Title: Electrophotographic photoreceptor for electrophotographic apparatus, has surface layer containing resin of preset viscosity average molecular weight and lubricating particle filler, and having preset loss tangent (2004-462680). cited by examiner PCT International Search Report and Written Opinion of the International Searching Authority, International Application No. PCT/JP2010/065569, Mailing Date Dec. 14, 2010. cited by applicant Tsuji, et al., U.S. Appl. No. 13/384,149, 371(c) Date Jan. 13, 2012. cited by applicant Nakamura, et al., U.S. Appl. No. 13/409,439, filed Mar. 1, 2012. cited by applicant Chinese Office Action dated Nov. 26, 2012 in Chinese Application No. 201080038986.1. cited by applicant Russian Office Action dated May 8, 2013 in Russian Application No. 2012112931. cited by applicant European Search Report dated May 2, 2013 in European Application No. 10813856.1. cited by applicant |
| Assistant Examiner: | Godo, Olatunji |
| Primary Examiner: | Vajda, Peter |
| Attorney, Agent or Firm: | Fitzpatrick, Cella, Harper and Scinto |
| Accession Number: | edspgr.09256145 |
| Database: | USPTO Patent Grants |
| Language: | English |
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