Patent ID: 7942561
Filing Date: 2011-05-17
Classification: G02B,G03B,H04N

Abstract:
1. One of a rod-shaped and plate-shaped light guide in combination with a case which houses the light guide, wherein the light guide comprises: a first end including an incident surface that receives illuminating light incident thereon; a second end longitudinally opposite the first end; a bottom surface having a reflecting portion which reflects illuminating light incident on the incident surface; an emitting face which emits the light reflected by the light reflecting portion; a protruding portion protruding longitudinally and continuously from the light guide at the second end thereof, the protruding portion having a reduced peripheral dimension on all sides thereof in comparison to a peripheral dimension of an adjacent portion of the light guide when viewed along an axial direction of the light guide; and a reflective body provided on the protruding portion and covering a longitudinal end face of the protruding portion which extends perpendicular to the emitting face of the light guide, wherein the reduced peripheral dimension of the protruding portion is set so that, when viewed along the axial direction of the light guide, the reflective body does not jut out from an end face of the light guide even when the reflective body wraps on to a side surface of the protruding portion or expansion occurs, and wherein when the light guide is housed in the case the protruding portion is directly surrounded by inner surfaces of the case.