Patent ID: 8811845
Filing Date: 2014-08-19
Classification: G03G

Abstract:
1. A registration mark comprising: a set of toner patterns that are formed on a transferred member, which moves along a plurality of toner-image forming units respectively using toners of a plurality of colors and forming a plurality of toner images of different colors, wherein the transfer member receives transfer of the plurality of toner images formed by the plurality of toner-image forming units, wherein the set of toner patterns provides information of toner-image formation positions of the plurality of toner-image forming units to an optical sensor that emits light and receives reflected light, wherein the toners of the plurality of colors comprise a low-reflectance group having a relatively low spectral reflectance and a high-reflectance group having a relatively high spectral reflectance with respect to the light emitted by the optical sensor, wherein the set of toner patterns comprises: