| 摘要 |
PURPOSE:To compact a stereo-microscope by arranging a range-finding light-projecting means between the right and left binocular enlarging optical systems, so that a focusing mechanism can be driven on the basis of the signal of a range-finding means. CONSTITUTION:A binocular enlarging optical system 20 is constituted in such a way that an objective lens 11 is arranged in front of a binocular telescopic optical system consisting of a first group 21 of right and left zoom lenses or the like and eyepiece lenses 26, so that the focus can be adjusted to a finite distance. Further, a down- projection lighting means 30 projects light toward a subject W through the objective lens 11 by means of a light source 31 that has been arranged nearly in parallel with the light source of the objective lens 11, a condenser lens group 32, two rectangular prisms 33, 34, and a relay lens 36. Further, a range-finding light-projecting means 40 is arranged between the binocular enlarging optical system 20. On the other hand, in the rear on the opposite side of the down-projection lighting means 30, an active type range finding means 45 is arranged. The range finding 45 comprises a range- finding system lens 46, a range-finding prism 47, and a range-finding optical system by means of a detection module 48; so that the operation of the subject W can be calculated for driving a focusing mechanism. |
