Patent ID: 7847983
Filing Date: 2010-12-07
Classification: H04N

Abstract:
1. An image reading apparatus comprising: an original placement portion on which an original is to be placed; an optical unit provided below the original placement portion and configured to move relative to the original placement portion; and a guide member that guides movement of the optical unit and supports the optical unit from below; wherein the optical unit includes a unit frame configured to hold an optical element, and includes a slider configured to slide on the guide member, said slider having a screw that is vertically threaded in a screw hole formed in the unit frame and that rides the guide member, wherein a vertical position of the unit frame relative to the guide member is adjusted in accordance with a rotating amount of the screw, such that the optical element is thereby raised or lowered in order to adjust an imaging parameter of an output image; wherein a plurality of projecting portions are provided on a root of a thread of the screw along a circumference of the thread, and are provided in an area other than a tip end area of the screw, wherein each of the projecting portions of the screw are plastically deformable into a different shape and are plastically deformed while being screwed into the screw hole, and wherein the plastic deformation of the projecting portions of the screw absorbs play in a mount portion between the screw and the screw hole formed by the unit frame.