Electrifying roller for electrophotographic apparatus

Provided is a charging roller for an electrophotographic device, which suppresses toner contamination, tearing breakage of an elastomer layer, and peeling of a surface layer, and which has excellent charging properties. A charging roller (10) is provided with: a shaft body (12); an elastic body laye...

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Bibliographische Detailangaben
Hauptverfasser: MIYAGAWA SHIMPEI, SAITO YOSHIHIRO
Format: Patent
Sprache:chi ; eng
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Beschreibung
Zusammenfassung:Provided is a charging roller for an electrophotographic device, which suppresses toner contamination, tearing breakage of an elastomer layer, and peeling of a surface layer, and which has excellent charging properties. A charging roller (10) is provided with: a shaft body (12); an elastic body layer (14) formed on the outer peripheral surface of the shaft body (12); and a surface layer 16 that is formed on the outer peripheral surface of the elastic body layer 14, the elastic body layer 14 containing a silicone rubber, and the outer peripheral surface of the elastic body layer 14 having a plurality of large protrusions 18a having a width of 13 [mu] m to 48 [mu] m and a height of 5 [mu] m to 13 [mu] m. The surface of the large convex part 18a is provided with a plurality of small convex parts 18b which form irregularities having a ten-point average roughness Rz of 1.0-6.0 [mu] m, the surface layer 16 contains a urethane polymer, and the elongation at break of the surface layer 16 is 285-525%. 本发明提供一种抑制调色剂污染、弹