Patent ID: 7369736
Filing Date: 2008-05-06
Classification: G02B

Abstract:
1. A light tunnel comprising: a guide member for directing an incident light to proceed therein while being reflected by a side wall thereof and to merge the incident light into a uniform light beam, the guide member having a first end portion and a second end portion; and optical path change portions provided respectively at the first end portion and the second end portion of the guide member, the optical path change portions each having an outer surface which is slanted with respect to an optical axis of the incident light, to reflect the incident light and redirect a path thereof; wherein the outer surface of one of the optical path change portions is slanted in a first direction and reflects the incident light to an inside of the guide member, the outer surface of the other optical path change portion is slanted in a second direction, such that the first direction is not parallel to the second direction, and reflects the light which proceeds in the guide member to an outside of the guide member, and wherein the side wall comprises a reflection portion, the reflection portion being between the optical path change portions such that the incident light reflected from the optical path change portion at the first end portion of the guide member is directed to the reflection portion and becomes uniform.