Image reading apparatus, image forming apparatus, and image reading method

摘要

An image reading apparatus includes: light-receiving elements arranged in a main-scanning direction to perform photoelectric conversion pixel by pixel; AD converter units that convert each piece of analog data photoelectric-converted by the light-receiving elements into parallel pieces of digital data; a storage unit that stores therein each of the digital data converted by the AD converter units; a converter unit that reads the digital data stored in the storage unit and converts the read digital data into serial data in the main-scanning direction; a readout control unit that changeably controls a readout start pixel and a readout end pixel of the serial data in the main-scanning direction; and a period change unit that changes a period in which the converter unit converts digital data into serial data in the main-scanning direction based on the readout start pixel and the readout end pixel.

主权项

1. An image reading apparatus comprising:
a plurality of light-receiving elements configured to be arranged side by side in a main-scanning direction and to perform photoelectric conversion pixel by pixel; a plurality of AD converter units configured to convert each piece of analog data received from the plurality of light-receiving elements into parallel pieces of digital data; a storage unit configured to store therein each of the parallel pieces of digital data converted by the plurality of AD converter units; a converter unit configured to read the digital data stored in the storage unit and convert the read digital data into serial data in the main-scanning direction; a readout control unit configured to changeably control a readout start pixel and a readout end pixel of the serial data converted by the converter unit in the main-scanning direction; and a period change unit configured to change a period in which the converter unit converts the digital data into serial data in the main-scanning direction based on the readout start pixel and the readout end pixel controlled by the readout control unit.