Patent ID: 8576454
Filing Date: 2013-11-05
Classification: G03G

Abstract:
1. An image forming method executed in an image forming system comprising an image generating unit and an image forming unit, the image forming unit having a storage storing a first curve information including both components of a first type curve and a second type curve and a second curve information including a component of the first type curve without a component of the second type curve, the method comprising: a first information transmitting step of transmitting the first curve information stored in the storage to the image generating unit by the image forming unit; a first generating step of generating first corrected image data by shifting pixels included in predetermined pattern image data in a sub scan direction based on the first curve information transmitted in the first information transmitting step by the image generating unit; a first image transmitting step of transmitting the first corrected image data generated in the first generating step to the image forming unit by the image generating unit; a first forming step of forming a first image on a recording medium based on the first corrected image data transmitted in the first image transmitting step by the image forming unit; a first measuring step of measuring a shift amount of the first image formed in the first forming step from a predetermined reference by the image forming unit; a first storing step of storing a curve information calculated based on the shift amount measured in the first measuring step into the storage as the first curve information stored in the storage by the image forming unit, in a case where the shift amount measured in the first measuring step is less than a predetermined threshold value; a second information transmitting step of transmitting the second curve information stored in the storage to the image generating unit by the image forming unit, in a case where the shift amount measured in the first measuring step is not less than the predetermined threshold value; a second generating step of generating second corrected image data by shifting pixels included in the predetermined pattern image data in a sub scan direction based on the second curve information transmitted in the second information transmitting step by the image generating unit; a second image transmitting step of transmitting the second corrected image data generated in the second generating step to the image forming unit by the image generating unit; a second forming step of forming a second image on a recording medium based on the second corrected image data transmitted in the second image transmitting step by the image forming unit; a second measuring step of measuring a shift amount of the second image formed in the second forming step from a predetermined reference by the image forming unit; a second storing step of storing a curve information calculated based on the shift amount measured in the second measuring step into the storage as the first curve information stored in the storage by the image forming unit.