| 主权项 |
1. An image reading apparatus comprising:
a command unit configured to generate a command signal periodically; a reading unit configured to read an original in a main scanning direction in accordance with the command signal every time the command signal is generated; a conveying unit configured to perform a conveying process for conveying at least one of the reading unit and the original so as to change a relative position between the reading unit and the original in a sub scanning direction; a signal output unit configured to output a displacement signal every time the relative position is changed by a predetermined reading interval; and a control unit configured to control a generation timing at which the command signal is generated by the command unit, wherein a generation period of the command signal is less than an output time interval at which the displacement signal is outputted by the signal output unit in the conveying process, the control unit is configured to determine, with respect to the command signal periodically generated, an elapsed time elapsed from an output timing at which the displacement signal has been outputted by the signal output unit until a generation timing at which the command signal is generated by the command unit after the displacement signal has been outputted, and under a condition that the elapsed time is less than a reference value, the control unit delays generating the command signal until the elapsed time is not less than the reference value. |
