Image forming apparatus that prevents conspicuous unevenness in image density
US7555252B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 16, 2007 |
| Grant date | Jun 30, 2009 |
| Priority date | — |
| Expiry date | Aug 4, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/0818
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An image forming apparatus includes: an image bearing body that is rotatable about a central axis thereof, and that bears a dot-like latent image, on a surface of the image bearing body, in each of a plurality of divided regions that are arranged in rows along a direction that intersects an axial direction of the central axis at a predetermined intersection angle; and a developer bearing roller that is rotatable in order to make visible, as a developer image, the dot-like latent images borne by the image bearing body, using a developer borne on a surface of the developer bearing roller, the developer bearing roller opposing the image bearing body such that an axial direction of the developer bearing roller is parallel to the axial direction of the image bearing body, and that includes a helical groove portion on the surface of the developer bearing roller, the helical groove portion being inclined at a predetermined inclination angle with respect to the axial direction of the developer bearing roller and being formed having a uniform pitch in the axial direction, wherein a value that is a tangent of the inclination angle divided by a ratio of a moving speed of the surface of the de…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.