Patent ID: 7295355

Claim:
An image reading apparatus comprising: an image reading device having a plurality of solid-state image sensing device arrays arranged to be parallel to each other, the image reading device for optically reading an image on an original, each of the plurality of solid-state image sensing device arrays reading respective positions of the image on the original; and a registration adjusting device that adjusts the respective positions for reading the image on the original, the adjustment being made based on a gap defined by an interval between the solid-state image sensing device arrays, wherein the registration adjusting device includes: a first flat plate glass on which reflection light from the original is incident at a substantially right angle; and a second flat plate glass on which the reflection light is incident at a predetermined angle, which is not a right angle; and wherein the registration adjusting device makes the reflection light to transmit one of the first and second flat glasses selectively to change a light axis of the reflection light.