Image reading apparatus

An image reading apparatus comprising;

• an apparatus housing;
• a platen provided in the apparatus housing;
• image reading means disposed in the apparatus housing;
• first and second carriages moving along an original document image on the platen at predetermined velocities;
• a light source supported on the first carriage to emit light to the original document image on the platen;
• a first mirror supported on the first carriage to deflect reflected light from the original document toward the second carriage;
• one or more second mirrors supported on the second carriage to guide the light from the first mirror to the image reading means;
• right and left paired rail members for supporting the first and second carriages to enable the carriages to move along the original document image on the platen;
• and
• driving means for moving each of the first and second carriages,
• wherein the first carriage is provided with first and second mirror support portions for supporting one side edge portion of the first mirror by two points having a predetermined distance therebetween in a carriage movement direction, and a third mirror support portion for supporting the other side edge portion by one point,
• the first mirror is supported on the first, second and third mirror support portions by three points,
• the first carriage is supported slidably at its opposite side edge portions respectively on the right and left paired rail members via slide members disposed at four right and left places including two front and back places having a predetermined distance therebetween in the carriage movement direction, and
• a height position is configured to be adjustable in at least one of slide members at two front and back places disposed on the third mirror support portion side for supporting the first mirror by one point.