Optical device, image reading apparatus, and image forming apparatus for suppressing stray light using light shielding body that overlap rows of lens array and covered by regulating body with through holes

An image reading apparatus comprising:

• a light source 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 element that receives light passing through the plurality of lenses.

An image forming apparatus comprising:

• a light source 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 element 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 element.