| 摘要 |
The object of the present invention is to provide an image reading apparatus having a large depth of field and being compact in size. The image reading apparatus includes a light source 2, an imaging optics system 1, an image pickup device unit 41, 42, 43, 44, 45, a memory 5, and a processor 6. The imaging optics system has a plurality of cells (11, 12, 13, 14, 15, Fig.4) each being an independent optics system arranged in a main scanning direction 211, and arranged in two rows in a sub-scanning direction 212. In each of the cells, a first reflective light-gathering optical element 100, a first plane mirror (105, Fig.25), an aperture 101, and a second reflective light-gathering optical element 102 are arranged in this order from a document 7, and the aperture is arranged at the back focal point position of the first reflective light-gathering optical element to form a telecentric optics system at the side of the document.
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