Patent
Charge roller for an image forming apparatus
| العنوان: | Charge roller for an image forming apparatus |
|---|---|
| Patent Number: | 5,786,091 |
| تاريخ النشر: | July 28, 1998 |
| Appl. No: | 08/534,003 |
| Application Filed: | September 25, 1995 |
| مستخلص: | In a charging device included in an image forming apparatus for charging an image carrier uniformly, a charge roller has an elastic layer and a surface layer. The elastic layer is made of a substance having a medium electric resistance and having no conductive particles dispersed therein. The surface layer is made of a non-adhering substance having a greater non-adhering property than the substance constituting the elastic layer. |
| Inventors: | Kurokawa, Junji (Yokohama, JPX); Nojima, Kazuo (Chiba, JPX); Chiba, Masako (Urawa, JPX); Nakahara, Toshio (Yokohama, JPX) |
| Assignees: | Ricoh Company, Ltd. (Tokyo, JPX) |
| Claim: | What is claimed is |
| Claim: | 1. A charge roller for charging a photoconductive element included in an image forming apparatus, comprising |
| Claim: | a metallic core; |
| Claim: | a voltage source connected to the metallic core to apply a voltage to the metallic core; |
| Claim: | an elastic layer made of a substance having a predetermined electric resistance and having no conductive particles dispersed therein formed around the metallic core; and |
| Claim: | a surface layer made of a non-adhering substance being formed around the elastic layer, the surface layer being formed by a fluorine-containing resin soluble in a solvent; |
| Claim: | wherein said substance having a predetermined electric resistance comprises epichlorohydrin rubber formed by a ternary copolymer of epichlorohydrin/ethylene oxide/arylglycidil ether. |
| Claim: | 2. The charge roller as claimed in claim 1, wherein said fluorine-containing resin of said surface layer is a fluorine-containing bridged copolymer produced by bridging the fluorine-containing resin with isocyanate, the fluorine-containing resin being comprised of a fluoroolefin and hydroxyl group-containing vinyl ether. |
| Claim: | 3. The charge roller as claimed in claim 1, wherein said fluorine-containing resin of said surface layer is a fluorine-containing bridged copolymer. |
| Claim: | 4. A charge roller for charging a photoconductive element included in an image forming apparatus, comprising |
| Claim: | a surface layer made of non-adhering substance being formed directly around the elastic layer to directly contact the elastic layer, the surface layer being formed by a fluorine-containing resin soluble in a solvent, the surface layer being 5 .mu.m to 10 .mu.m thick, wherein said substance having a predetermined electric resistance comprises epichlorohydrin rubber formed by a ternary copolymer of epichlorohydrin/ethylene oxide/arylglycidil ether. |
| Claim: | 5. A charge roller for charging a photoconductive element included in an image forming apparatus, comprising |
| Claim: | a surface layer made of non-adhering substance being formed directly around the elastic layer to directly contact the elastic layer, the surface layer being formed by a fluorine-containing resin soluble in a solvent, the surface layer being 5 .mu.m to 10 .mu.m thick, wherein said substance having a predetermined electric resistance comprises epichlorohydrin rubber formed of a binary copolymer of epichlorohydrin/ethylene oxide. |
| Claim: | 6. A charge roller for charging a photoconductive element included in an image forming apparatus, comprising |
| Claim: | a surface layer made of non-adhering substance being formed directly around the elastic layer to directly contact the elastic layer, the surface layer being formed by a fluorine containing resin soluble in a solvent, the surface layer being 5 .mu.m to 10 .mu.m thick, wherein said substance having a predetermined electric resistance comprises epichlorohydrin rubber implemented by at least one of a ternary copolymer of epichlorohydrin/ethylene oxide/arylglycidil ether and a binary copolymer of epichlorohydrin/ethylene oxide. |
| Current U.S. Class: | 428/421; 428/463; 428/378; 428/390; 428/332; 428/358; 399/176; 361/221; 361/225; 492/53; 492/56 |
| Current International Class: | B32B 2508; G03G 1502 |
| Patent References Cited: | 3935517 January 1976 O'Brien 4522866 June 1985 Nishikawa 4727453 February 1988 Ewing 4922299 May 1990 Uchimoto et al. 4958193 September 1990 Nojima 5038174 August 1991 Kato et al. 5089851 February 1992 Tanaka et al. 5168313 December 1992 Hosaka et al. 5463410 October 1995 Uchiyama et al. 5499078 March 1996 Kurokawa et al. |
| Other References: | Database WPI, Derwent Publications, vol. 17, No. 138 (P-1505), AN 92-418341, JP-A-4311942, Nov. 4, 1992. McGraw-Hill Dictionary of Scientific and Technical Terms, 4th Ed., p. 1699, publication date not given. Encyclopedia of Polymer Science and Engineering, vol. 6, pp. 308-315, "Epichlorohydrin Elastomers", John Wiley & Sons, Inc., 1986. Bennet, Concise Chemical & Technical Dictionary, 4th Ed, Chem Publ., 1993. |
| Primary Examiner: | Yamnitzky, Marie |
| Attorney, Agent or Firm: | Oblon, Spivak, McClelland, Maier & Neustadt, P.C. |
| رقم الانضمام: | edspgr.05786091 |
| قاعدة البيانات: | USPTO Patent Grants |
| الوصف غير متاح. |