IMAGE READING APPARATUS

摘要

An image reading apparatus includes: a reading unit having a plurality of photoelectric conversion elements arranged in a main scanning direction; a white reference plate arranged to face the reading unit; a motor configured to move at least one of an original and the reading unit relative to each other; and a controller configured to: control the reading unit to read the white reference plate to obtain white reference data; determine, based on a driving velocity of the motor, whether relative position between the original and the reading unit has changed by a predetermined distance; and output a displacement signal in a case of determining that the relative position between the original and the reading unit has changed by the predetermined distance.

主权项

1. An image reading apparatus comprising:
a reading unit having a plurality of photoelectric conversion elements arranged in a main scanning direction, each of the plurality of photoelectric conversion elements being configured to generate an electric signal in response to receiving light from an reading object; a white reference plate arranged to face the reading unit; a motor configured to move at least one of an original and the reading unit relative to each other, and a controller configured to:
control the reading unit to read the white reference plate to obtain white reference data;determine, based on a driving velocity of the motor, whether relative position between the original and the reading unit has changed by a predetermined distance; andoutput a displacement signal in a case of determining that the relative position between the original and the reading unit has changed by the predetermined distance, wherein in a case of reading the image of the original by the reading unit, the controller is configured to:
generate a first transfer timing signal which is synchronized with the displacement signal; andprovide the first transfer timing signal to the reading unit such that a first electric signal generated by the plurality of photoelectric conversion elements is transferred in synchronization with the first transfer timing signal and the displacement signal, and in a case of obtaining the white reference data, the controller is configured to:
generate a second transfer timing signal which is not synchronized with the displacement signal; andprovide the second transfer timing signal to the reading unit such that a second electric signal generated by the photoelectric conversion elements is transferred in synchronization with the second transfer timing signal.