Image reader

摘要

An image reader is provided, which includes a first image reading unit configured to read an image on a first side of a first document sheet being conveyed on a feeding path, and output an analog signal corresponding to the read image of the first side, a second image reading unit configured to read an image on a second side opposite to the first side of the first document sheet being conveyed on the feeding path, and output a digital signal corresponding to the read image of the second side in a differential transmission method, and a control board configured to process the analog signal output from the first reading unit and the digital signal output from the second image reading unit.

主权项

1. An image reader comprising:
a first image reading unit comprising a first sensor configured to read an image on a first side of a first document sheet being conveyed on a feeding path, and output a first analog signal corresponding to the read image of the first side; a second image reading unit comprising:
a second sensor configured to read an image on a second side of the first document sheet being conveyed on the feeding path, and output a second analog signal corresponding to the read image of the second side;a first analog-digital converter configured to convert the second analog signal output from the second sensor into a first-order digital signal, and output the first-order digital signal; anda differential transmitter configured to convert the first-order digital signal output from the first analog-digital converter into a second-order digital signal for differential transmission, and output the second-order digital signal in a differential transmission method; and a control board comprising a processor, the control board configured to process the first analog signal output from the first sensor of the first reading unit and the second-order digital signal output from the differential transmitter of the second image reading unit.