Patent ID: 8643909
Filing Date: 2014-02-04
Classification: H04N

Abstract:
1. An image reader comprising: a first-side reading unit including: a second-side reading unit including: a feeder configured to feed the document sheet along a feeding path in a sub scanning direction perpendicular to the main scanning direction; a reflection surface disposed to face the second-side reading unit across the feeding path; a light projecting unit configured to project second light toward a part of the reflection surface such that a bright area and a dark area are formed on the reflection surface, wherein the light projecting unit comprises a light guide having a first end facing the first-side light emitting portion and a second end, and wherein the light guide is configured to guide therethrough light incident onto the first end to the second end, so as to project the guided light as the second light from the second end toward the part of the reflection surface; a reference position determining unit configured to, in a state where the bright area and the dark area are formed on the reflection surface when the light projecting unit projects the second light: wherein the first-side light emitting portion comprises a first section and a second section in the main scanning direction, the first section being located in an area within a width of the first pressing member in the main scanning direction, the second section being located in an area outside the width of the first pressing member in the main scanning direction, and wherein the light guide is disposed such that the first end thereof faces the second section in a position outside the width of the first pressing member in the main scanning direction and that light emitted from the second section of the first-side light emitting portion is incident onto the first end of the light guide.