Patent ID: 9639785
Date: 2017-05-02
CPC Classifications: G06K,H04N

Claim:
1. An image forming apparatus comprising: a transfer unit configured to transfer an image formed on a photoreceptor to a transfer medium; a power supply unit configured to supply transfer power to the transfer unit; a density sensor configured to sense a density of the image transferred to the transfer medium; a stationary reference reflective plate, separate from the density sensor, configured to be sensed by the density sensor; and a control unit configured to control the power supply unit so that the transfer power supplied to the transfer unit is adjusted, wherein the density sensor is allowed to move from a first position for sensing a density of sample patches formed on the transfer medium to a second position for sensing a density of the stationary reference reflective plate, the density sensor rotates with respect to a hinge provided to one side of the density sensor to move from the first position to the second position, and the control unit performs a sensor compensation mode, in which a sensing value of the density sensor is compensated according to the density of the stationary reference reflective plate sensed by the density sensor at the second position, and performs a density compensation mode in which the transfer power supplied to the transfer unit is adjusted according to the density of the sample patches sensed by the density sensor at the first position to thereby compensate the density of the image transferred to the transfer medium.