Patent ID: 6963430

Claim:
An image reading apparatus comprising: a scanner unit which optically scans an original; a drive unit which moves said scanner unit; a mode setting unit which sets between a normal processing mode and a high-speed processing mode; and a controller, wherein when an operation of reading an image of the original has been completed, in said normal processing mode, said controller controls said drive unit to move said scanner unit to a home position, and thereafter sets an energized electric power of said drive unit at a minimum electric power, and keeps an energized state of said drive unit for a predetermined period of time, wherein when said controller is instructed to start a reading of an image of a succeeding original within the predetermined period of time, said controller performs a shading compensation for compensating an output of said scanner unit, and thereafter performs an operation of reading the image of the succeeding original, and in said high speed processing mode, said controller sets the energized electric power of said drive unit at the minimum electric power without moving said scanner unit to the home position, and keeps the energized state of said drive unit for the predetermined period of time, wherein when said controller is instructed to start the reading of the image of the succeeding original within the predetermined period of time, said controller performs the operation of reading the image of the succeeding original without performing the shading compensation.