Patent ID: 7188989

Claim:
A light guide plate comprising: a light receiving portion disposed adjacent a light source; and a light guide body extending from the light receiving portion and disposed adjacent a display body to be illuminated the light receiving portion having a light receiving surface disposed to face the light source and receiving light emitted from the light source, the light guide body including a light emitting surface disposed to face the display body and transforming light received by the light receiving surface into planar emission, wherein the light receiving portion and the light guide body comprise a single plate shaped member formed in a unit, wherein the light guide body has a constant thickness, and wherein said light receiving portion further includes a light introducing portion having a thickness that progressively decreases from said light receiving surface toward the light guide body, so that said light receiving surface has an enlarged form, the thickness of said light introducing portion is the same as the thickness of the light guide body at a boundary of the light introducing portion and the light guide body, and said enlarged light receiving surface is provided at a generally central part in a width direction of the light guide plate and over only a part of the width of the light guide plate.