Patent ID: 9046829
Filing Date: 2015-06-02
Classification: G03G

Abstract:
1. An image formation apparatus comprising: a primary transfer unit configured to transfer a developer image formed on an image carrier to an intermediate transfer body; a secondary transfer unit configured to transfer the developer image transferred to the intermediate transfer body to a recording medium; a voltage application unit configured to apply a voltage to the secondary transfer unit; a voltage controller configured to control the voltage to be applied to the secondary transfer unit by the voltage application unit; a recording medium type detector configured to detect a type of the recording medium; and a recording medium width detector configured to detect a width of the recording medium in a direction orthogonal to a conveyance direction of the intermediate transfer body, wherein the voltage controller controls the voltage to be applied to the secondary transfer unit, based on the type of the recording medium detected by the recording medium type detector and the width of the recording medium detected by the recording medium width detector, wherein the voltage controller includes a current measurement unit configured to measure current flowing through the secondary transfer unit when the voltage application unit applies a voltage thereto with the recording medium not present at the secondary transfer unit, based on a detection result obtained by the recording medium type detector, the voltage controller controls the voltage that the voltage application unit applies to the secondary transfer unit when the current measurement unit is to measure the current flowing through the secondary transfer unit, and a density of current flowing through the recording medium is adjusted to a value suitable for the type of the recording medium by the voltage controller controlling the voltage applied to the secondary transfer unit based on a calculated value of a density of current flowing through the recording medium, the calculated value being calculated from a result of the measurement on the current flowing through the secondary transfer unit and the width of the recording medium detected by the recording medium width detector.