Reading module and image reading device and image forming apparatus therewith

Abstract

The invention provides a reading module, an image reading device with the reading module, and an image forming apparatus. The reading module has a light source which irradiates light to a document; anoptical system which images, as image light, reflected light of the light radiated from the light source to the document; and a sensor converting the image light imaged by the optical system into anelectrical signal. The optical system has a mirror array in which reflection mirrors are coupled together in an array in the main scanning direction and an aperture stop portion having a first aperture adjusting the amount of image light reflected from a reflection mirror and a second aperture shielding stray light that enters the first aperture from an adjacent reflection mirror. The second aperture is arranged at such a position as to be able to shield stray light passing through a boundary between the reflection mirrors and the center of the first aperture when the mirror array contracts tothe maximum extent in the main scanning direction.

Description

technical field [0001] The present invention relates to a reading module that irradiates a document with light and reads reflected image light used in a digital copier, an image scanner, and the like, and an image reading device and an image forming device including the reading module. Background technique [0002] Conventionally, as a reading method for an image reading device mounted on a digital multifunction machine or the like using an electrophotographic method, there are reduction optical systems that reduce and form an image, and imaging in a state of equal magnification without reducing the image. double optical system. [0003] The reduction optical system uses multiple flat mirrors and optical lenses for an image sensor that is smaller than the size of the original to form a reduced image and read the image. The image sensor in the zoom optical system uses a charge-coupled device called a CCD (Charge Coupled Devices) sensor. As an advantage of the reduction opti...

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Problems solved by technology

On the other hand, since the depth of field of the equal-magnification optical system is very small, when the original deviates from the specified position in the optical axis direction, the influence of the blur caused by the dispersion of the magnification of each lens and the image blur appears greatly

As a result, there is a disadvantage that book manuscripts and manuscripts with bumps cannot be read uniformly.

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