Title:
CHARGING ROLL FOR ELECTROPHOTOGRAPHIC EQUIPMENT
Document Type and Number:
WIPO Patent Application WO/2022/176820
Kind Code:
A1
Abstract:
Provided is a charging roll for electrophotographic equipment that is excellent in uniformity of discharge characteristics. A charging roll 10 has an elastic layer 14 having an outer peripheral surface provided with a groove portion 22 that spirals regularly along the axial direction. The groove portion 22 has a groove width w of 4-280 μm inclusive and a groove depth d of 2-30 μm inclusive. An area a of a bottom surface 221 of the groove portion 22 and an area b of a flat surface portion 24 of the outer peripheral surface of the elastic layer 14 have a surface area ratio a/b of 0.3-2.4 inclusive. A surface layer 16 includes a binder polymer 16a and roughness-forming particles 18, and the roughness-forming particles 18 are disposed on the flat surface portion 24 and on the groove portion 22. A part of the surface layer 16 that falls within a region M above the groove portion 22 has a surface roughness Rz of 2-16 μm inclusive, and the entire surface layer 16 has a surface roughness Rz of 5-26 μm inclusive. A part of the binder polymer 16a that covers a roughness-forming particle 18a on the groove portion 22 has a thickness t1 larger than a thickness t2 of a part of the binder polymer 16a that covers a roughness-forming particle 18b on the flat surface portion 24.
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Inventors:
SAITO YOSHIHIRO (JP)
UKAI HIROSHI (JP)
ISHIDA MASANORI (JP)
UKAI HIROSHI (JP)
ISHIDA MASANORI (JP)
Application Number:
PCT/JP2022/005776
Publication Date:
August 25, 2022
Filing Date:
February 15, 2022
Export Citation:
Assignee:
SUMITOMO RIKO CO LTD (JP)
International Classes:
F16C13/00; G03G15/00; G03G15/02
Foreign References:
| JP2007225995A | 2007-09-06 | |||
| JP2007047322A | 2007-02-22 |
Attorney, Agent or Firm:
YAMADA, Kazuhiro (JP)
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