| 摘要 |
An endoscope attachment has optics for viewing with the naked eye having the first optical axis coinciding with the optical axis of an endoscope, imaging optics having the second optical axis perpendicular to the first optical axis, and a beam separating prism that splits rays of light coming from the endoscope into two beams that are respectively launched into the two optics. The beam separating prism has an entrance end face and the first exit end face which are both oriented perpendicular to the first optical axis, a first reflecting plane disposed between the entrance end face and the first exit end face, a second exit end face oriented perpendicular to the second optical axis, and a second reflecting plane disposed between the first optical axis and the second exit end face. The faces and planes are arranged in such a way that the rays of light reflected by the first reflecting plane are reflected successively by the entrance end face, the second exit end face and the second reflecting plane before they emerge from said second exit end face, so that the point of intersection between the first optical axis and the first reflecting plane is positioned closer to the entrance end face than the point of intersection between the first and second optical axes.
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