| 摘要 |
A stereoscopic objective lens system for video endoscopes and borescopes includes two full-diameter doublets and two lens pairs forming a stereo lens set. A rotatable dual telescope is disposed between the two doublets and the stereo lens pairs, establishing a Galilean telescope associated with each stereo channel. The Galilean telescopes are each rotatable, preferably in convert, to be in or out of alignment with the system optical axis. When out of alignment, the Galilean telescopes have no effect along the optical path. When in alignment, the Galilean telescopes provide an increase or decrease in magnification, depending on orientation of the telescopes. The full-diameter doublets present equal-angle pairs from symmetrically disposed object points to the lenses of the stereo lens pair. This equal-angle property enables accurate object/image mapping onto the final stereo image pair, such that all parts of each left/right image can be mapped to within a fraction of a video pixel to each other.
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