Patent ID: 7051941

Claim:
An image reading apparatus for reading an original, comprising: a casing, a scanning unit disposed in the casing and movable in a sub-scanning direction for reading the original, a supporting member attached to the casing for supporting the scanning unit at one side thereof in a main scanning direction and guiding the scanning unit in the sub-scanning direction, a driving source for moving the scanning unit in the sub-scanning direction, a drive transmitting unit for transmitting a drive force of the driving source to the scanning unit, and first and second reinforcing plates attached to the casing along the sub-scanning direction for reinforcing the casing, said first reinforcing plate having a guide unit for supporting the scanning unit at the other side thereof in the main scanning direction and for guiding the scanning unit in the sub-scanning direction, said driving source and the drive transmitting unit being fixed to the second reinforcing plate.