Line sensor, image reading device, and image forming apparatus

A line sensor comprising:

• light-receiving-element rows each including a plurality of light receiving elements that are disposed in a first direction;
• and
• a plurality of transmitting portions that are disposed in correspondence with the plurality of light receiving elements,
• wherein the plurality of transmitting portions include first transmitting portions that transmit light having a first wavelength, second transmitting portions that transmit light having a second wavelength differing from the first wavelength, and third transmitting portions that transmit light having a third wavelength differing from the first wavelength and the second wavelength,
• wherein the plurality of light receiving elements that are disposed in the first direction include first light receiving elements corresponding to the first transmitting portions, second light receiving elements corresponding to the second transmitting portions, each second light receiving element being disposed towards a center of a corresponding one of the light-receiving-element rows so as to be adjacent to a corresponding one of the first light receiving elements, and third light receiving elements corresponding to the third transmitting portions, each third receiving element being disposed towards the center of a corresponding one of the light-receiving-element rows so as to be adjacent to a corresponding one of the second light receiving elements,
• wherein the light-receiving-element rows are disposed such that a first light-receiving-element row, a second light-receiving-element row, and a third light-receiving-element row are disposed side by side in three rows in a second direction orthogonal to the first direction,
• wherein the transmitting portions corresponding to the light receiving elements that are disposed side by side in the second direction in the first light-receiving-element row, the second light-receiving-element row, and the third light-receiving-element row include the first transmitting portions, the second transmitting portions, and the third transmitting portions,
• wherein a center of each first transmitting portion is displaced from a center of a corresponding one of the first light receiving elements in a direction of the center of a corresponding one of the light-receiving-element rows,
• wherein a center of each second transmitting portion is displaced from a center of a corresponding one of the second light receiving elements in a direction of the center of a corresponding one of the light-receiving-element rows, and
• wherein a center of each third transmitting portion is displaced from a center of a corresponding one of the third light receiving elements in a direction of the center of a corresponding one of the light-receiving-element rows.