| 摘要 |
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 directions relative to the wall and the original support plate, to positions whereat focuses are adjusted.
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