Patent ID: 7218427

Claim:
An image reading apparatus comprising: an original table which is transparent and has an upper surface on which an original is placed; a contact type image sensor arranged on the lower side of said original table; a sub-scanning unit arranged to move said contact type image sensor in a sub-scanning direction; first abutment members which are provided on said contact type image sensor to maintain a fixed distance between said original table and said contact type image sensor and which are arranged at at least two positions outside an effectively usable main scanning reading range of said contact type image sensor; a pressing member arranged to press said contact type image sensor so as to cause said abutment members to abut the lower surface of said original table; and second abutment members which are provided on said contact type sensor and arranged within the effectively usable main scanning reading range of said contact type image sensor and which are arranged at two positions which are located on both sides in a main scanning direction of a central portion of the main scanning reading range, where a deflection amount of the original table is maximum, and are vertically spaced apart from the lower surface of said original table by a predetermined distance at least in a case that the original table is not deflected.