| 发明名称 | Image forming apparatus and density change suppressing method | ||
| 摘要 | An image forming apparatus includes: a density detection unit that detects densities of an image developed by a developing unit at a plurality of positions in a main-scanning direction; a processing unit that obtains at least one of an amplitude and a phase of a first periodical density change of the image, of which cycle is a rotation cycle of a photosensitive drum, at the plurality of positions in the main-scanning direction on the basis of an output signal of the density detection unit, and corrects a drive signal for the light source so as to suppress the first periodical density change of the image at each position in the main-scanning direction on the basis of the rotation cycle of the photosensitive drum and at least one of the amplitude and the phase. | ||
| 申请公布号 | US8929759(B2) | 申请公布日期 | 2015.01.06 |
| 申请号 | US201313889781 | 申请日期 | 2013.05.08 |
| 申请人 | Ricoh Company, Limited | 发明人 | Iwata Muneaki;Akatsu Kazuhiro;Ishida Masaaki;Omori Atsufumi;Fujita Hayato |
| 分类号 | G03G15/00;G03G13/04;G03G15/043 | 主分类号 | G03G15/00 |
| 代理机构 | Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P. | 代理人 | Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P. |
| 主权项 | 1. An image forming apparatus comprising: a photosensitive drum; an optical scanning device that includes a light source, the optical scanning device scanning a surface of the photosensitive drum in a main-scanning direction using light from the light source, and that forms a latent image on the surface of the photosensitive drum; a developing unit that develops the latent image; a drum cycle detection sensor that detects a rotation cycle of the photosensitive drum; a density detection unit that detects densities of an image developed by the developing unit at a plurality of positions in the main-scanning direction; a processing unit that obtains at least one of an amplitude and a phase of a first periodical density change of the image, of which cycle is a rotation cycle of the photosensitive drum, at the plurality of positions in the main-scanning direction on the basis of an output signal of the density detection unit, and that corrects a drive signal for the light source so as to suppress the first periodical density change of the image at each position in the main-scanning direction on the basis of the rotation cycle of the photosensitive drum and at least one of the amplitude and the phase. | ||
| 地址 | Tokyo JP | ||