Abstract: A linear light source device for image reading. The main body of the linear light source device includes at least a light-guide bar and a light source assembly. The light-guide bar is a polygonal column with one surface having stripes thereon, acting as a reflective plane with a reflective function. The opposite plane to the reflective plane is a light-exiting plane, and all the remaining planes are reflective layers. At least one of the ends of the polygonal column is an incident plane for a light beam to enter. Light is transmitted through both of the two ends of the polygonal column (or one end with the other end acting as a reflective plane) and uniformly transmits through the light-exiting plane. The light-guided bar has a simple structure and configuration, a compact volume, a high rate of utilization in light energy, is flexibly changed in length, and is easy to manufacture with high product yield and low manufacturing cost.

Abstract: A linear light source device is provided having a main body that includes at least a light-guided bar and a light source assembly. The light-guided bar is a polygonal column with one striped surface forming, a reflective plane. The plane the opposite to reflective plane is a light-exiting plane having a convex profile, with the remaining planes being reflective planes. At least one of the ends of the polygonal column is an incident plane for a light beam to enter. The light beam is uniformly transmitted through the convex-shaped light-exiting plane.

Abstract: A linear light source device for image reading is disclosed. The main body of the linear light source device includes at least a light-guided bar and a light source assembly. The light-guided bar is a polygonal column with one of its surface, having stripes thereon, acted as a reflective plane with reflective function. The opposite plane of the reflective plane is a light-exiting plane in convex profile, and all the remaining planes are reflective planes. At least one of the ends of the polygonal column is an incident plane for light beam to enter. Light beam transmits from both of the two ends of the polygonal column (or one end with other end acted as a reflective plane) and uniformly transmits through the convex-shaped light-exiting plane. The light-guided bar of the invention having simple in structure and configuration, compact in volume, high rate of utilization in light energy, and being flexible in changing its length is easy to manufacture with high product yield and low manufacturing cost.

Abstract: A linear light source device for image reading is disclosed. The main body of the linear light source device includes at least a light-guided bar and a light source assembly. The light-guided bar is a polygonal column with one of its surface, having stripes thereon, acted as a reflective plane with reflective function. The opposite plane of the reflective plane is a light-exiting plane in convex profile, and all the remaining planes are reflective planes. At least one of the ends of the polygonal column is an incident plane for light beam to enter. Light beam transmits from both of the two ends of the polygonal column (or one end with other end acted as a reflective plane) and uniformly transmits through the convex-shaped light-exiting plane. The light-guided bar of the invention having simple in structure and configuration, compact in volume, high rate of utilization in light energy, and being flexible in changing its length is easy to manufacture with high product yield and low manufacturing cost.