| 摘要 |
An endoscope with an objective lens drive mechanism for an objective lens system. The insertion instrument of the endoscope is provided with an angle section on the proximal side of the rigid tip end section for flexibly bending at least in upward and downward directions. Provided on an end face of a casing of a rigid tip end section of the insertion instrument are at least a illumination window, an observation window and an exit opening of a biopsy channel. An objective lens system includes a fixed lens mounted on a fixed lens frame, and at least a movable lens mounted on a movable lens frame. For rationally laying out internal components, the interior of the casing of the rigid tip end section is divided into right and left subsections along a center line of upward and downward flexures of the angle section. The observation window is located across the center line of upward and downward flexures to occupy part of both of the right and left subsections. The exit opening of the biopsy channel is located in one of the right and left subsections, while a lens drive shaft of the objective lens drive mechanism is located in the other one of the right and left subsections. An offset arm which is extended out from the movable lens frame is engaged with the lens drive shaft through a translating means which converts forward and reverse rotations of the lens drive shaft into back and forth linear movements of the movable lens frame. Connect to the lens drive shaft is a control cable which is constituted by a flexible transmission shaft encased in a flexible sleeve, the fore end of which is fixedly connected to the casing of the rigid tip end section.
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