Patent ID: 7883460

Claim:
An endoscope comprising: an insertion portion provided with a freely curvable curving portion on a distal end side of the insertion portion; a grip portion provided at a base end side of the insertion portion and grasped by an operator; an instructing operation portion, which is present at the grip portion and in its periphery, with a function of implementing a curve instructing operation of the curving portion and a function of implementing another instructing operation different from the curve instructing operation; and a curved shape display processing portion for implementing curved shape display processing for displaying three-dimensionally a curved shape near the curving portion in the case of implementing a curve instructing operation on the curving portion by the instructing operation portion on a display, the curved shape display processing portion being provided inside the endoscope, wherein the curved shape display processing portion comprises: a displacement detecting portion for detecting displacement in a vertical direction and in a horizontal direction of a curve actuator and for detecting a total displacement in the vertical direction and the horizontal direction in the curve actuator, the curve actuator for curving the curving portion; a curve radius detecting portion for detecting curve radius when approximating a curved shape of a curving portion to a circular arc based on information from the curving portion; an angle component detecting portion for detecting angle components corresponding to displacement components in the horizontal direction of the total displacement; a depiction processing portion for implementing depiction processing of displaying a curve shape of the curving portion corresponding with the total displacement; and a rotational depiction processing portion for implementing depiction processing of causing a depiction model of the curving portion generated by the depiction processing to rotate by the angle component to the display.