Linear light source device for image reading

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. In addition, it possesses the merits of having multi-function of generating monochromatic and color lights, high luminance, and low cost.

Dependencies are inferred from the claim text.