Contact image scanner with multi focallength and multi resolution

The image scanner includes following parts: a circuit board; at least two sets of sensitizing element array (SEA) including first set of SEA and second set of SEA, and the two sets of SEA arranged parallel to each other located above the circuit board; at least one set of columnar lens composed of first and second columnar lenses; first columnar lens and second columnar lens suspended on the corresponding first set of SEA and second set of SEA; a first glass is suspended on the set of columnar lens; a second glass is suspended between the first columnar lens and the first set of SEA. Using two sets of SEA, the set of columnar lens, and the second glass forms at least two focuses and resolutions in order to scan different objects to be scanned on the glass.