Patent ID: 8817344

Claim:
A scanner apparatus for scanning and reading a document placed on a transparent plate, comprising: a line sensor unit; a holder to hold the line sensor unit; a mechanism configured to scan the line sensor unit and the holder along a surface of the transparent plate; a first spacer and a second spacer disposed on both sides of the line sensor unit in a longitudinal direction and configured to contact the transparent plate; and a biasing unit configured to bias the holder toward the transparent plate at a center position between the first spacer and the second spacer in the longitudinal direction by applying a force to the holder, which presses the line sensor unit from above the first and second spacers, thereby eliminating a moment to bend the line sensor unit, wherein the line sensor unit and the holder are coupled together on both sides of the line sensor unit in the longitudinal direction and are not in contact with each other at the center position.