| 摘要 |
An electronic endoscope includes a distal end portion of an insertion portion which incorporates an image pickup unit, a first metal frame which holds an observation window, a second metal frame which holds an objective optical system, a third metal frame which is made to fit with a rear portion of the second metal frame and holds an electronic component, an anti-fogging unit which prevents fogging of the observation window, and a thermal insulation member which thermally insulates the anti-fogging unit and the second metal frame from each other to inhibit transmission of heat generated in the anti-fogging unit to the third metal frame, an outer circumferential face of which fits with an inner circumferential face of the first metal frame, and an inner circumferential face of which fits with an outer circumferential face of the second metal frame. |
