| 摘要 |
The guide (1004) has an external surface forming a guiding diopter, where the guide is provided for guiding light rays by reflection on the guiding diopter. A decoupling portion (1030) is arranged with a refraction decoupling diopter (1034) so as to refract the light rays to decouple the rays from the guide, and to transmit the rays out of the guide through the refraction decoupling diopter. The decoupling portion is arranged on a section of variable cross-section (1024) that is adjacent to an end of the guide. The section of the variable cross-section of the guide comprises a fastening unit. |
