Patent ID: 9415617
Filing Date: 2016-08-16
CPC Classification: B41J

Claim Text:
1. An image forming apparatus comprising: a recording head to discharge ink to a recording medium to form an image thereon; an optical sensor to output a signal in response to intensity of reflection of light emitted to a direction of discharging the ink; a carriage that carries the recording head and the optical sensor; and a control unit to detect a position of the recording medium within a range of movement of the carriage based on the signal output by the optical sensor and control the recording head to discharge the ink only onto the position of the recording medium, wherein the control unit acquires a value according to the signal output by the optical sensor in response to the movement of the carriage and detects the position of the recording medium within the range of movement of the carriage when a predetermined relation between the value and a threshold continues at least for a predetermined interval in the movement of the carriage.