Illuminators include transparent light emitting members having a pattern of rounded shallow notches or grooves in one or more surfaces of the members for causing internally reflected light to be emitted from the members. The notches or grooves may be cut using a circular cutting tool. The relative speed...http://www.google.ca/patents/US6910783?utm_source=gb-gplus-sharePatent US6910783 - Transparent light emitting members and method of manufacture
