Patent ID: 8035868
Filing Date: 2011-10-11
Classification: H04N

Abstract:
1. A light source unit configured to apply light to a surface of an object and to receive light reflected from the surface of the object in order to read the object, the light source unit comprising: a line light source having a longitudinal axis; a rod lens having a longitudinal axis substantially in parallel with the longitudinal axis of the line light source, the rod lens having a first optical-axis plane and a second optical-axis plane, the first optical-axis plane containing a plurality of optical axes passing through a first linear line focus group containing a plurality of first focuses, the second optical-axis plane containing a plurality of optical axes passing through a second linear line focus group containing a plurality of second focuses; and a linear reflector located on an opposite side of the rod lens as compared to the line light source and at a position crossing the second optical-axis plane of the rod lens, wherein the first linear line focus group and the second linear line focus group are located substantially at a position where the second optical-axis plane when reflected from the linear reflector crosses the first optical-axis plane.