Original reading unit, image forming apparatus and image scanner

Abstract From the Canadian patent

In a photocopier or the like, an original reading unit is provided wherein between a unit base and a transparent original support plate multiple sensor assemblies are arranged in a zigzag pattern as first and second arrays for sequentially reading an original. Each of the sensor assemblies includes a sensor holder a line sensor and a focus setup unit. Each of the sensor holders is rotatable about a single rotation center along a wall of the base to a predetermined position and fixed to the wall. The line sensors are held relative to the sensor holders, in the main scanning direction and in the sub-scanning direction. The focus setup units move the line sensors in approaching or separating …