Patent ID: 6512632
Filing Date: 2003-01-28
Classification: G02B

Abstract:
A rough/fine-movement drive mechanism of a focusing device, comprising:a rough-movement coupling shaft, to both ends of which rough-movement handles are attached; a fine-movement coupling shaft rotatably provided coaxially with the rough-movement coupling shaft; a movement mechanism for vertically moving a stage in accordance with rotation of the rough-movement coupling shaft, and decelerating rotation of the fine-movement coupling shaft and moving the stage by an amount of movement less than an amount of movement provided by the rotation of the rough-movement coupling shaft; a fine-movement ring provided at each of both ends of the fine-movement coupling shaft, disposed outside each of the rough-movement handles, and having a smaller outside diameter than an outside diameter of each of the rough-movement handles; and a fine-movement handle detachably attached to at least one of the fine-movement rings.