| 摘要 |
A fixed lens of an optical objective lens system is fixedly retained on a support member which is provided in a rigid tip end section (3a) of an endoscopic insertion instrument (3), along with a movable lens or lenses (41a, 41b) which are movable toward and away from the fixed lens (40a, 40b) in the direction of optical axis of the objective lens system (36). A drive means (37) for the movable lenses (41a, 41b) is coupled with the support member, while an image sensor means (35) is located at the focus of the objective lens system (36). A guide means (54, 43) which guides the support member of an optical assembly (34) in the direction of the optical axis is connected to the image sensor means (35). The support member is slid along the guide means (54) to adjust the optical objective lens system (36) into an in-focus position with respect to the image sensor means (35). After adjusting the position of the optical objective lens system (36), the support member is fixed to the guide means (54) by the use of an optical assembly fixation means. <IMAGE> |
