Image-forming apparatus
US10747133B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 12, 2019 |
| Grant date | Aug 18, 2020 |
| Priority date | — |
| Expiry date | Jul 12, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G21/18
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A image-forming apparatus includes a plurality of process cartridges each having a toner and an image bearing member, and has an intermediate transfer member, wherein the toner comprises a toner particle that contains a toner base particle and a prescribed organosilicon polymer on the surface of the toner base particle, and the organosilicon polymer forms protruded portions on the surface of the toner base particle, for the protrusions having a protrusion height H from 40 nm to 300 nm, the numerical proportion P(D/w) of protruded portions having a ratio of the protrusion diameter D to the protrusion width w in a prescribed range is at least 70 number %, and one of the plurality of process cartridges has a carbon black-containing black toner, and the weight-average particle diameter of this black toner is smaller than that of the toner present in the other process cartridges.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.