Optical device, image reading apparatus, and image forming apparatus

An image reading apparatus comprising:

• an irradiation unit that irradiates a document with light;
• a lens body including a plurality of lenses of which optical axes are arranged alongside each other and through which light reflected from the document passes;
• a light shielding body that is provided to face a light incident surface of the lens body, and includes a transmitting portion that is positioned on the optical axes of the plurality of lenses and transmits light, and a light shielding unit that is positioned on a portion other than the optical axes of the plurality of lenses and shields the passage of light;
• a regulating body that is provided to face a light incident surface of the light shielding body, includes an opening narrower than the transmitting portion, and regulates a part of light toward the transmitting portion;
• and
• a light receiving unit that receives light passing through the plurality of lenses.

An image forming apparatus comprising:

• an irradiation unit that irradiates a document with light;
• a lens body including a plurality of lenses of which optical axes are arranged alongside each other and through which light reflected from the document passes;
• a light shielding body that is provided to face a light incident surface of the lens body, and includes a transmitting portion that is positioned on the optical axes of the plurality of lenses and transmits light, and a light shielding unit that is positioned on a portion other than the optical axes of the plurality of lenses and shields the passage of light;
• a regulating body that is provided to face a light incident surface of the light shielding body, includes an opening narrower than the transmitting portion, and regulates a part of light toward the transmitting portion;
• a light receiving unit that receives light passing through the plurality of lenses;
• and
• an image forming unit that forms an image based on light received by the light receiving unit.