Patent ID: 6357903
Filing Date: 2002-03-19
Classification: H04N,Y10S

Abstract:
A line type illuminator having a scanning direction in a longitudinal direction, and a sub-scanning direction being orthogonal to said scanning direction and being narrow in width thereof, comprising:a light source unit being constructed with a plurality of light sources, each of which can be activated independently; a rod-like transparent light guide, having a reflective surface opposing said light source unit at one end in the longitudinal direction thereof; and a case, in which the rod-like transparent light guide is received, wherein said rod-like transparent light guide is formed to have a polygonal cross-section thereof, a chamfered portion formed as a light emission surface and formed in the longitudinal direction at a comer thereof, and a main light scattering pattern formed in a portion intersecting a normal line of said light emission surface and opposing thereto, wherein an auxiliary light scattering pattern is provided between said main light scattering pattern and said light source unit, and said auxiliary light scattering pattern is shifted outside from a longitudinal center line of said main light scattering pattern, and further a normal line from the auxiliary light scattering pattern intersects a center line of any one of said plurality of light sources extending in the longitudinal direction.