Patent ID: 9037017
Filing Date: 2015-05-19
Classification: G03G

Abstract:
1. An image forming apparatus comprising: a rotatably driven endless-shaped image carrier; an image forming unit configured to form an image on said image carrier; a sensor configured to irradiate light to said image carrier and output light reception data based on a result of receiving a reflected light from a light irradiation area to which the light is irradiated; a correction unit configured to correct patch light reception data output from said sensor on a basis of a reflected light from a measurement image formed on said image carrier by said image forming unit, based on correction light reception data corresponding to a reflected light from an area in said image carrier on which the measurement image has been formed; an adjustment unit configured to adjust image forming conditions for said image forming unit based on the patch light reception data corrected by said correction unit; an identifying unit configured to identify a time period with which the area on which the measurement image has been formed passes through the light irradiation area, based on a first light reception data output from said sensor during a first time period with which an attention area of said image carrier passes through the irradiation area before said image carrier rotates one lap and a second light reception data output from said sensor during a second time period before the attention area passes through the light irradiation area again until the attention area finishes passing through the light irradiation area after said image carrier rotated one lap; and a determination unit configured to determine the correction light reception data by selecting light reception data corresponding to the time period identified by said identifying unit from among base light reception data output from said sensor between the first time period and the second time period.