发明名称 |
Image forming apparatus and image forming method |
摘要 |
<p>The present invention is aimed at carrying out high-precision and stable image formation using a gray-level image forming technique. In carrying out image formation by a gray-level electrophotographic process, the relationship between the layer thickness Tp of the photosensitive layer on the photosensitive member and the exposure diameter Db of a light beam emitted onto the photosensitive member is defined as 2Tp < Db, so that the charge diffusion and electric field in the photosensitive layer on the photosensitive member can be small. The maximum exposure within the exposure diameter Db is set at a value that can sufficiently reduce the differential sensitivity of the photosensitive layer, where the exposure diameter Db of the light beam is the minimum diameter at 1/e<2> with respect to the peak value of the exposure distribution obtained by integrating the energy distribution of the light beam with the exposure time. In this manner, excellent gray-level image presentation can be obtained, and high-precision and stable image formation can be carried out by using a region of damping characteristics on the photosensitive member. <IMAGE></p> |
申请公布号 |
EP1548514(B1) |
申请公布日期 |
2012.06.06 |
申请号 |
EP20050006372 |
申请日期 |
1997.10.06 |
申请人 |
RICOH COMPANY, LTD. |
发明人 |
SAWAYAMA, NOBORU;KOSUGE, AKIO;TAKEHARA, ATSUSHI;YOSHIMURA, HIROSHI;MAEDA, KATSUHIKO |
分类号 |
G03G13/04;G03G15/00;B41J2/44;G03G5/08;G03G15/04;G03G15/043;G03G15/32;H04N1/29 |
主分类号 |
G03G13/04 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|