Importance

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Abstract

A carriage includes an optical system that detects reflected light from an image reading position on a document. A carriage controller controls, when the image of the document is to be read, movement of the carriage through a drive device, on the basis of the position of the carriage with respect to a predetermined reference position. A carriage travel measurer performs measurement about the movement of the carriage, and generates a measurement value. A reset decider decides whether the position of the carriage recognized by the carriage controller has to be reset, on the basis of the measurement value. When it is decided that the position of the carriage has to be reset, the carriage controller detects the reference position, and resets the position of the carriage.

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First Claim