Reading module, and image reading device and image forming apparatus therewith

A reading module comprising:

• a light source which irradiates a document with light;
• an optical system which images, as image light, reflection light of the light with which the light source has irradiated the document;
• and
• a sensor having a plurality of imaging regions which convert the image light imaged by the optical system into an electric signal,
• wherein
• the optical system includes
• a mirror array in which a plurality of reflection mirrors, each having a reflection surface formed as an aspherical concave surface, are connected together in an array in a main scanning direction, and
• a plurality of aperture stop portions which are each provided between one of the reflection mirrors and one of the imaging regions of the sensor, and which adjust an amount of the image light reflected from the reflection mirrors,
• the reflection mirrors are each provided so as to reflect light at an angle that is different, as seen in the main scanning direction, from an angle at which an adjacent one of the reflection mirrors reflects light,
• the plurality of aperture stop portions are disposed on one side of the mirror array with respect to an orthogonal direction which is orthogonal to the main scanning direction, and
• the imaging regions are each disposed so as not to overlap with an adjacent one of the imaging regions in the orthogonal direction.