| 摘要 |
In an objective optical system of a stereoscopic endoscope, a pair of positive lenses are disposed downstream a pair of negative lenses for the right and left eyes at the leading end of the scope so as to respectively correspond thereto, whereby aberrations generated by the pair of negative lenses are corrected favorably. Successively from the object side, a negative lens pair 1, a positive lens pair 2, and a positive lens group 3 are disposed, whereby an incident luminous flux from the object side is caused to form an image on an imaging surface 6 of a CCD. The image-surface-side planar surfaces of the lenses L2 in the second lens pair 2 are respectively formed with stops 5 which are attached thereto or deposited thereon. Each of the lenses L1 constituting the first lens pair 1 and its corresponding lens L2 constituting the second lens pair 2, with the stop 5, are integrated together in a concentric state; and thus formed pair of members are disposed in parallel for the right and left eyes, while being made movable symmetrically to each other in directions (arrowed A directions) with respect to the optical axis of the positive lens group 3.
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