Image reading apparatus

An image reading apparatus for reading an image based on reflected light from a document in a predetermined image reading area, comprising:

• a light irradiator configured to irradiate light to a document in the image reading area;
• an optical system configured to image reflected light from the document irradiated with the light by the light irradiator;
• and
• a photoelectric converter configured to convert an optical image imaged by the optical system into an electrical signal,
• wherein:
• the optical system includes:
• a reflection mirror unit configured to reflect the reflected light from the document to the photoelectric converter and image the reflected light on the photoelectric converter and including a first reflection area and a second reflection area successively provided in a main scanning direction;
• and
• an aperture unit arranged on an imaging optical path from the reflection mirror unit to the photoelectric converter and including a light shielding portion having light shielding properties and a first light passing hole and a second light passing hole formed to penetrate through the light shielding portion and allow the passage of the light reflected by each of the first and second reflection areas;
• and
• the photoelectric converter is a line image sensor including a light receiving surface having a first light receiving area and a second light receiving area configured to receive the light passed through each of the first and second light passing holes and successively arranged in the main scanning direction, and configured to convert each optical image based on the light received by each of the first and second light receiving areas into an electrical signal, and a length of the light receiving surface along the main scanning direction is set to be equal to or longer than that of the image reading area along the main scanning direction.