IMAGE READING APPARATUS

摘要

An image reading apparatus includes: a reading unit which reads an original as an object to be read in a main scanning direction every time a command signal is inputted; a command unit which inputs the command signal to the reading unit; a conveying unit which conveys at least one of the original and the reading unit so as to change a relative position between the reading unit and the original in a sub scanning direction; a signal output unit which outputs a displacement signal every time the relative position is changed by a predetermined amount; and a control unit which controls the command unit. The command unit which operates in a first mode to output the command signal to the reading unit at a predetermined time interval and in a second mode to output the command signal to the reading unit at a timing synchronized with the displacement signal.

主权项

1. An image reading apparatus comprising:
a reading unit configured to read an original in a main scanning direction every time a command signal is inputted to the reading unit; a command unit configured to output the command signal to the reading unit; a conveying unit configured to execute a conveyance processing for conveying at least one of the original and the reading unit 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 amount; and a control unit configured to control the command unit, wherein the command unit operates in a first mode to output the command signal to the reading unit at a predetermined time interval, and in a second mode to output the command signal to the reading unit at a timing synchronized with the displacement signal, the conveyance processing includes an acceleration segment in which relative velocity between the original and the reading unit is accelerated to a predetermined velocity, a constant velocity segment in which the relative velocity is controlled to be the predetermined velocity, and a deceleration segment in which the relative velocity is decelerated from the predetermined velocity, and the control unit is configured to control the command unit to operate in the first mode in the acceleration and deceleration segments, and to operate in the second mode in the constant velocity segment.